Hey everyone, my computer is failing the 'wiggle test,' while it's hooked up but being tapped gently, the engine is shutting off.
My question is, should I replace it or perhaps only the PROM chip in it? How do I know if the PROM went bad and not the computer? DOes a new computer come with a prom?

My symptoms are rough driving, car idles really rough on EVERY stop light/traffic stop and almost shuts off.

Please help!!!!

 

replace ecm and the new does not come with a prom and needs to be transfered over to the new ecm

 

I had that very same problem . ECM no code 12 with engine at idle tap on side of ecm if engine rpm changes replace the unit
the mem cal will be ok . I spent hours looking for bad contacts [etc] but a new ECM fixed the problem Steve

 

Unfortunately, I STILL have the same problem, I'm getting to the point where I'm almost ready to redo the entire electrical in the car....can ANYONE Please help

 

Have you replaced the ECM,if you have is it second hand or new
you may have another dud

 

New from Chevy themselves

 

Make sure that the chip is locked in tight and both wiring looms are pluged in and making good contact if ok and the engine runs rough or changes tune when you tap the ECM it has to be in ECM internal circuit the same as mine was , if the car runs ok otherwise it wont be the chip