Guys im having a huge problem. While just driving around, doesn't matter what rpm or how far down i am on the gas, (even coasting) It starts running on 3 cylinders for about 1 min. Then after that 1 min its perfectly fine. If i am very very easy on it 5 % throttle it will not do it very much. if i am more throttle then that it runs fine for a bit, then right back on 3 cylinders. I've ran a compression test and it showed 150 on all 4. Put 2 different spark plugs in and it doesn't make a difference. I have swapped out the ignition coil with a brand new one. Still same thing. I was about to replace map sensor, swap to my stock fuel injectors but then i thought i would ask. Also my gauges on my dash reset all by themselfs quite a bit. Im trying to give all the information i can- this misfire has occured before but completely went away. Many many times it would do this and just disappear but now its not. Maybe a bad pcm?? You say i'll do. please someone help me out.

Wet weather and bad contact in wiring could cause symptoms.

gauges resetting by themselfs - causing me to think its a bad pcm. Friday im going to change all the fuel injectors to make sure ones not getting stuck open for some odd reason. there all brand new. These pcms in the ecotec do these go bad alot?

Bump for some help....come on guys... i called chevy and they want 550 for a new ecu. I called junkyards and they want 130. Does anyone have a spare ecu for the ecotec service num- 12210553. I read of all these post and alot of people say they have another ecu where do you guys get these from!!!! Anyone have one they would sell me?

I'll see what I can find for you.