Engine only firing on left bank. 94Q45. Replaced cam position. Sensor

no
the purpose of the crank position sensor is to tell the ECM where the piston is so that the ignition can fire the coil and to the plug at the correct time
if it is defective , it will not allow it to fire , , run properly
code p 0018 refers to crank shaft /cam shaft position , bank 2 sensor A --correlation===causes wiring-- Crank sensor--- Cam sensor-- mechanical fault

when you see mechanical fault and you have a sluggish engine or other problems , it could be that the cam control servo is malfunctioning and that is reporting as a correlation problem because the ECM is getting varying readings as to where the cam position really is in relation to the crank position and rpm

(1) Camshaft Position (CMP) Actuator Solenoid - Intake Bank 1
(2) Camshaft Position (CMP) Sensor - Intake Bank 1
(3) Camshaft Position (CMP) Sensor - Intake Bank 2
(4) Camshaft Position (CMP) Actuator Solenoid - Intake Bank 2
(5) Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 2
(6) Camshaft Position (CMP) Sensor - Exhaust Bank 2
(7) Generator
(8) A/C Compressor Clutch
(9) Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 1
(10) Camshaft Position (CMP) Sensor - Exhaust Bank 1

same as all 3.7s
on the cam (its V6 so has 2 cams)
one left bank, one right bank

quote SM
The Camshaft Position Sensor (CMP) on the 3.7L 6-cylinder engine is bolted to the right-front side of the right cylinder
head.

Check to see if the cam position sensor or the crank position sensor is misaligned or has a corroded connector plug. The ECM needs to get a firing pulse from all cylinders. If the engine is a dual cam and is not attempting to start, some engines have a timing device (chain) for each bank. If the chain broke on one bank, the cam sensor can not possibly fire because the cam is not turning.

for the code po340 go to this site it will help you out. obd-codes.com/po340

Generic OBD II Diagnostic Trouble Codes

DTC CODES P0300 to P0399

P0300....Random/Multiple Cylinder Misfire Detected

P0301....Cylinder 1 Misfire Detected

P0302....Cylinder 2 Misfire Detected

P0303....Cylinder 3 Misfire Detected

P0304....Cylinder 4 Misfire Detected

P0305....Cylinder 5 Misfire Detected

P0306....Cylinder 6 Misfire Detected

P0307....Cylinder 7 Misfire Detected

P0308....Cylinder 8 Misfire Detected

P0309....Cylinder 9 Misfire Detected

P0310....Cylinder 10....Misfire Detected

P0311....Cylinder 11 Misfire Detected

P0312....Cylinder 12 Misfire Detected

P0313....Misfire Detected with Low Fuel

P0314....Single Cylinder Misfire (Cylinder not Specified)

P0320....Ignition/Distributor Engine Speed Input Circuit

P0321....Ignition/Distributor Engine Speed Input Circuit Range/Performance

P0322....Ignition/Distributor Engine Speed Input Circuit No Signal

P0323....Ignition/Distributor Engine Speed Input Circuit Intermittent

P0324....Knock Control System Error

P0325....Knock Sensor 1 Circuit (Bank 1 or Single Sensor)

P0326....Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)

P0327....Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

P0328....Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

P0329....Knock Sensor 1 Circuit Input Intermittent (Bank 1 or Single Sensor)

P0330....Knock Sensor 2 Circuit (Bank 2)

P0331....Knock Sensor 2 Circuit Range/Performance (Bank 2)

P0332....Knock Sensor 2 Circuit Low Input (Bank 2)

P0333....Knock Sensor 2 Circuit High Input (Bank 2)

P0334....Knock Sensor 2 Circuit Input Intermittent (Bank 2)

P0335....Crankshaft Position Sensor A Circuit

P0336....Crankshaft Position Sensor A Circuit Range/Performance

P0337....Crankshaft Position Sensor A Circuit Low Input

P0338....Crankshaft Position Sensor A Circuit High Input

P0339....Crankshaft Position Sensor A Circuit Intermittent

P0340....Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor)

P0341 Camshaft Position Sensor 'A' Circuit Range/Performance (Bank 1 or Single Sensor)

P0342....Camshaft Position Sensor 'A' Circuit Low Input (Bank 1 or Single Sensor)

P0343....Camshaft Position Sensor 'A' Circuit High Input (Bank 1 or Single Sensor)

P0344....Camshaft Position Sensor 'A' Circuit Intermittent (Bank 1 or Single Sensor)

P0345....Camshaft Position Sensor 'A' Circuit (Bank 2)

P0346....Camshaft Position Sensor 'A' Circuit Range/Performance (Bank 2)

P0347....Camshaft Position Sensor 'A' Circuit Low Input (Bank 2)

P0348....Camshaft Position Sensor 'A' Circuit High Input (Bank 2)

P0349....Camshaft Position Sensor 'A' Circuit Intermittent (Bank 2)

P0350....Ignition Coil Primary/Secondary Circuit

its possible there are multiple coil packs usually one for each bank or one for every two cylinders. Or check for a ignition control module

will likely be on the bank with 153 ...the other bank is even numbers 246 .

this car has but one bank, the cam sensor is under the intake manifiold on the drivers side.

On many engines with distributor less ignition systems and sequential fuel injection, a camshaft position sensor is used to keep the engine's control module informed about the relative position of the crankshaft. By monitoring cam position (which allows the control module to determine when the intake and exhaust valves are opening and closing), the control module can use the cam position sensor's input along with that from the crankshaft position sensor to determine which cylinder in the engine's firing sequence is approaching top dead center. This information is then used by the engine control module to synchronize the pulsing of sequential fuel injectors so they match the firing order of the engine. On some applications, input from the camshaft position sensor is also required for ignition timing.
The camshaft position sensor may be magnetic or Hall effect, and mounted on the timing cover over the camshaft gear, on the end of the cylinder head in an overhead cam application, or in a special housing that replaces the distributor (in the case of some of the GM applications). Operation and diagnosis is essentially the same as that for a crankshaft position sensor.  

Re  check the wire harness and the sensor installation to the camshaft sensor in Bank #1 which is where the #1 cylinder is. Good luck and hope this adds some light to you question, keep me posted and be glad to help.