Wide open throttle there is no rpm like ignition problems has a9 cam big bore kit with the big valves high-performance plug coil and cd put 24mm manual carb jetted

Making More Horsepower

1. Full throttle only, on hot days, at low rpm. Carburetor is a bit lean in needle seat or main jet. Not too serious. We all have this problem sometimes.
2. Full throttle only, on hot days, at mid or high rpm. Carburetor is a bit lean in needle seat or main jet. This is more serious. Get on this problem soon.
3. Happens even while cruising at a constant speed. Carburetion is way too lean, or compression ratio is too high, or the gas you just bought is Tijuana special, cut with #2 diesel. Pull off the road, call for a trailer. This is big time serious.

Black smoke on full throttle acceleration.
Main jet is too rich.
Grey smoke on full throttle acceleration.
Bad valve guide seals, or bad rings. The engine was mis-assembled.
Grey smoke when you start the engine, particularly when cold.
Bad valve guide seals. The engine was mis-assembled.
Ticking sound which goes faster and slower as the engine does.

1. Bad spark plug connection to ignition coil (pray this is it).
2. Stuck lifter.
3. Improper valve to valve clearance, or improper valve to piston clearance.

Engine misses at idle or full throttle acceleration.
Bad connection from ignition coils to spark plugs.
Truly crummy gas mileage, as in less than 40 when cruising, or less than 35 around town.

1. Too much cam duration. You're blowing gas out your exhaust pipes.
2. Carburetor is way too rich, especially in the midrange.
3. Accelerator pump on carburetor is adjusted too aggressively.

OBDII DTC

P1001 Key on engine running unable to complete; key on engine running aborted

P1100 Mass air flow sensor intermittent

P1101 Mass air flow sensor out of self test range

P1104 Mass Airflow (MAF) Sensor Ground Circuit Malfunction

P1107 Left MAP Sensor Circuit

P1108 Right MAP Sensor Circuit

P1112 IATS Circuit High Voltage

P1113 IATS Circuit Low Voltage

P1121 Pedal Position Sensor Circuit A Range/Performance

P1122 Pedal Position Sensor Circuit A Low Voltage

P1123 Pedal Position Sensor Circuit A High Voltage

P1137 No Rear HO2S Response

P1138 No Rear HO3S Response

P1157 No Rear HO2S Response

P1158 No Rear HO3S Response

P1171 All Cylinders Too Lean

P1172 All Cylinders Too Rich

P1176 Adaptive Fuel Metering Trim Too Lean

P1177 Adaptive Fuel Metering Trim Too Rich

P1178 Adaptive Fuel Metering Trim Too Lean

P1179 Adaptive Fuel Metering Trim Too Rich

P1187 Both Front HO2S Heater Circuits (High Resistance)

P1188 Both Front HO2S Heater Circuits (Open Short to Ground High Resistance)

P1190 Both Front HO2S Heater Circuits (High Battery Voltage Short to Voltage)

P1193 Both Front HO2S Heater Circuits (High Resistance MAF Sensor Fault)

P1194 Both Front HO2S Heater Circuits (Open Short to Ground High Resistance)

P1196 Both Front HO2S Heater Circuits (High Battery Voltage Short to Ground)

P1198 Fuel Level Sensor (High Voltage)

P1199 Fuel Level Sensor (Low Voltage)

P1201 No. 1 Fuel Injector

P1202 No. 2 Fuel Injector

P1203 No. 3 Fuel Injector

P1204 No. 4 Fuel Injector

P1205 No. 5 Fuel Injector

P1206 No. 6 Fuel Injector

P1221 Pedal Position Sensor Circuit B Range/Performance

P1222 Pedal Position Sensor Circuit B Low Voltage

P1223 Pedal Position Sensor Circuit B High Voltage

P1224 Electronic Throttle Control Position Error

P1226 Mechanical Guard Circuit Range Performance

P1227 Mechanical Guard Circuit Low Input

P1228 Mechanical Guard Circuit High Input

P1229 Throttle Control Circuit Malfunction

P1230 Fuel Pump Relay Malfunction

P1235 VSV 1 Circuit Range/Performance

P1236 VSV 1 Vacuum Circuit Failure

P1237 VSV 2 Atmosphere Circuit Failure

P1238 VSV 3 Release Circuit Failure

P1240 Throttle Position Sensor Voltage Malfunction//Sensor Reference Voltage Low (Throttle

Fuel Tank Pressure)

P1241 Throttle Position Sensor Voltage Low Input//Reference Voltage Low (Throttle Fuel

Tank Pressure)

P1242 Throttle Position Sensor Voltage High Input

P1243 Throttle Position Sensor Ground Malfunction

P1245 Crank Signal Low Input

P1246 Crank Signal High Input

P1313 Misfire Catalyst Damage Bank No. 1

P1314 Misfire Catalyst Damage Bank No. 2

P1315 Misfire Excess Emissions

P1316 Misfire Rate Above Limit

P1335 Crankshaft Position Sensor Circuit

P1336 Camshaft Position Sensor (CMP) Circuit Performance

P1361 Ignition Coil Primary Circuit (Cylinder No. 1)

P1362 Ignition Coil Primary Circuit (Cylinder No. 2)

P1363 Ignition Coil Primary Circuit (Cylinder No. 3)

P1364 Ignition Coil Primary Circuit (Cylinder No. 4)

P1365 Ignition Coil Primary Circuit (Cylinder No. 5)

P1366 Ignition Coil Primary Circuit (Cylinder No. 6)

P1367 Ignition Monitor (Bank A)//Ignition System Failure Group 1

P1368 Ignition Monitor (Bank B)//Ignition System Failure Group 2

P1371 Early Activation Ignition Coil (Cylinder No. 1)

P1372 Early Activation Ignition Coil (Cylinder No. 2)

P1373 Early Activation Ignition Coil (Cylinder No. 3)

P1374 Early Activation Ignition Coil (Cylinder No. 4)

P1375 Early Activation Ignition Coil (Cylinder No. 5)

P1376 Early Activation Ignition Coil (Cylinder No. 6)

P1392 Variable Valve Timing Solenoid A Low Input

P1393 Variable Valve Timing Solenoid A High Input

P1396 Variable Valve Timing Solenoid B Malfunction

P1397 Variable Valve Timing Solenoid B Low Input

P1398 Variable Valve Timing Solenoid B High Input

P1400 EGR Valve Position Circuit (Valve Sticking Open or Short)

P1401 EGR Valve Position Circuit (Open Short to Ground)

P1408 EGR Temperature Sensor Circuit

P1409 EGR Valve Circuit

P1440 EVAP Purge Valve Open

P1441 EVAP Valve Circuit

P1443 EVAP Valve Circuit

P1447 EVAP Valve Circuit

P1448 EVAP Valve Circuit

P1454 EVAP System

P1474 Charge Air Coolant Pump Relay

P1475 Radiator Fans Slow Malfunction

P1476 Radiator Fans Fast Parallel Circuit Malfunction

P1506 Idle Speed Control Circuit (Low RPM; Bank B)

P1507 Idle Speed Control Circuit (High RPM; Bank B)

P1508 Idle Speed Control Circuit

P1509 Idle Speed Control Circuit

P1512 Throttle Position Sensor Idle Switch Sense Circuit

P1513 Throttle Position Sensor Idle Switch Sense Circuit

P1514 Park/Neutral Position Switch High Load Neutral/Drive

P1516 Gear Change Park/Neutral Malfunction

P1517 Engine Cranking Park/Neutral Malfunction

P1607 MIL Output Circuit

P1608 Automatic Transmission

P1609 Internal ECM Error

P1641 Fuel Pump Relay No. 1

P1646 Fuel Pump Relay No. 2

P1739 Automatic Transmission

P1775 Transmission Control Module MIL Circuit

P1776 Torque Reduction Request Signal

P1777 Torque Reduction Circuit

P1780 Automatic Transmission

P1781 Automatic Transmission

P1782 Automatic Transmission

P1783 Automatic Transmission

P1785 Automatic Transmission

P1790 Automatic Transmission

P1791 Automatic Transmission

P1792 Automatic Transmission
P1794 Automatic Transmission

Several issues can cause this problem, either singularly or in combination.. Check the throttle body for dirt and sticky carbon deposits. clean the throttle body using a spray can carburettor/choke cleaner, and with the throttle valve held open, wipe out the bore of the throttle body with a solvent soaked clean rag. Make sure the throttle valve is not sticking any where in the throttle travel between closed and open.

Next, check the idle air bypass valve that is mounted on the top of the throttle body, for dirt and carbon deposits inside that can cause the idle air bypass valve to stick in an open position. Clean the inside of the idle air bypass valve with carb cleaner.

If the ignition timing is over advanced, (Specifies timing advanced is10 degrees Before Top Dead Center, with the in-line spark out plug removed from the spout connector housing, and with the idle speed set to the idle RPM shown on the emissions sticker under the hood, with the engine fully warmed up,) use a timing light to check and set the ignition timing to specification.

The throttle position sensor must be installed on the throttle body using the required method or the idle speed will likely be excessively high. Beginning with the battery negative cable disconnected from the battery, and with the throttle position sensor removed, place the sensor in position on the throttle body with the drive tabs on the sensor placed after the drive tabs on the throttle shaft, the holding the sensor on the throttle body, rotate the sensor counter clockwise to align the mounting screw holes in the sensor and the throttle body, Insert the sensor screws into the senor screw holes, into the threaded holes in the throttle body and tighten finger tight. Carefully center the sensor on the sensor screws, then tighten the screws firmly without over tightening. Reconnect the sensor electrical harness connector.

Inspect the throttle valve idle stop screw adjustment that holds the throttle valve open slightly, to prevent the throttle valve from touching the throttle body bore surface with the throttle closed, and the accelerator pedal unpressed.

Race cams do increase power, but reduce mileage and don't idle as well. Dual springs prevent float at high RPM, but it is not clear you want to rev that high as they do in racing. By performance kit, I assume the idea would be to cause ignition timing to be advanced more when accelerating. This will take advantage of the valve opening overlap from the race cams, but may require premium gasoline to prevent pre-ignition.
Technically I think you can do this without even removing the head. But it may be easier to remove it. And then it may be cheaper just to go with a larger bore or larger valves. If you don't have the tools for compressing the springs, then you will have to take it in anyway, in which case you can get their opinion. But it is within the capabilities of most home mechanics that understand how to replace a timing chain. You have to keep the crank and cam in correct synchronization. If you don't know what I mean, then don't try it without reading up on camshaft timing.

The most common issue is the spark plug boot shorts to the engine.