I have pontiac sunfire 96 model 2.2L engine. At parking and at stop position while in gear its rpm sometime jumps to 1400 for a momement then comes constant. Also when starting from stopped position engine is going to stop with engine check & etc light on, but when accelerate slowly this is not happening.

Check your idle air control valve

smack the dash just above the instrument panel while driving

will it shift left ?

replace or check the TPS on the throttle body

see if that helps

1st run scans for fault codes.

the 2.2 and the 2.4 liter engines are both timing chain driven engines.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

try putting water in it

The problem is the new PCM you installed does not have the correct VIN number of your car.
You may be able to relearn the VIN using the preceedure below, however, there is no gaurentee it will work. You may have to have a dealer reset the VIN for you by way of a scan tool.

1) Instert key into ignition and rotate to run position (do not try to start engine)
2) Leave the key in the run position for 10 minutes until security light stops flashing.
3) Turn ignition key to off position for 10 seconds ( no more, no less)
4) Turn ignition to run position again for 10 minutes until security light stops flashing and repeat step 3 and 4 for (1) more cycle.

The process is a security verification step for the VTD system. ( Vehicle Theft Deterent)

Give it a try, let me know.
Regards,

gue$$ing isn't the route to costly you must have engine light on OBD 2 scan for the fault and repair! if no engine light could be not working usually these come on every time something happens!!!!

I believe you have clutch or cable problem.

if it is a zero tolerance engine there is the possibilty valve damage has occured, depends if you were driving the car and at what speed it happened