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Having a misfire on my 1998 chevy truck 5.7. compression is good wires, plugs, injectors all check out good. what else could it be?

You forgot to mention whether it is a constant misfire, an on-load misfire or a light throttle misfire?

Try checking the spark power on each cylinder.
Locate the defective cylinder if you can.
Check for intake air leaks including vacuum pipes and hoses and the brake booster and egr system.

Forget about a compression test - these are rarely precise enough and only a cylinder leakage test will pin-point the smallest of valve seat defects, especially the intake...

May 09, 2017 | Cars & Trucks

1 Answer

My 1998 cavalier runs good but when going 55mph. The car starts jerking

Most likely it is the Throttle Position Sensor (TPS). Since 55 mph is a relatively constant speed for many drivers, the TPS get a work spot at that location and causes signal drop out to the ECM, resulting in a jerking feeling almost like a high speed intermittent engine misfire.

Feb 19, 2016 | Cars & Trucks

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check your crankcase breather system may need cleaning and check for dirty air filter.and clean the throttle body at the butterfly with throttle cleaner.

Dec 18, 2013 | BMW Cars & Trucks

1 Answer

2003 hyundai santa fe constantly jerks while idling.

it has to do with the injection system. Might be something stupid like a manifold intake gasket leak (commonly known as cylinder 4 misfire problem) or it could be a part of the system like : spark plugs, wiring, fuel injector, throttle position sensor. A low cost solution worth trying is a kleen flow injection system cleaner. It will remove a lot of carbon and see if it helps...

Mar 20, 2013 | 2003 Hyundai Santa Fe

2 Answers

1991 tracker with a 1.6. has a miss when running. when up to speed and holding at a steady speed miss gets worse. drove for about an hour and started cutting out very bad lost speed,power. converter red...

Do a compression test of the engine. See if your valves are seating properly is what you'd be looking for in checking for low compression. It could be causing the miss. When you changed plugs, did any one plug stand out as being different in color or texture at its base? The constant miss might put black sooty deposits on the spark plug. Course you'd have to remember which cylinder that plug came from to help you locate the miss. I'm assuming you have throttle body injection?

Feb 21, 2013 | 1991 Geo Tracker

1 Answer

Rough idle random cylinder misfire

misfires are more from problem injectors, low fuel pressure or injector wiring than from plugs
have a fuel pressure test done to check for problem pressure regulator , problem fuel pump , blocked m/dirty filter
one other area of concern is the EVAP system where the purge valve doesn't vent the tank properly and causes low fuel flow rates

May 27, 2017 | 1999 Jeep Grand Cherokee

1 Answer

I have a 2005 altima 4 cyl., when starting it has a rough idle so i sprayed throttle body cleaner in the throttle and wiped it clean then started the car and sprayed some more throttle body cleaner into...

Problems with Nissan 2005 Altima include-Crank shaft position sensor with ECU reset, ECU Factory reset from Dealer, Low Fuel pressure requiring fuel pump replacement, Replacement of ignition coils causing misfire during start-Catalytic Converter Recall-Oxygen sensor on exhaust-Leaking Valve cover gasket-Radiator failure due to plastic top & Bottom (Constantly adding water to reservoir?)

Aug 28, 2011 | 2005 Nissan Altima

1 Answer

Constant misfire,(hunting) have changed,plugs,leads distributer,injectors,timing checked,no air leaks,no codes showing.CO% 8.5

Hello! I suspect that the vehicle has a defective Throttle Position Sensor (TPS)...It is mounted on the throttle body...You can locate it by its wire colors...Black, White, and Pink/Black...If you have knowledge of a voltmeter, you can test it...Locate the sensor...push the end of a paper clip into the rear of the connector on the Black wire and another into the White wire...
With the car at idle put the negative meter probe on the Black and the positive on the White...Set the scale on the meter to read 1-5 volts...At idle you should read less than 1 volt...Have someone slowly increase engine speed...The voltage should rise to 4 volts without jumping, or erratic needle movement...If the voltage skips, jumps, or acts erratic the TPS is defective...


I’m happy to help further over the phone at

Mar 12, 2010 | 1998 Nissan Pathfinder

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