Originally Posted by Mike1995
I'm wondering if the IAC isn't closing. Engine runs fine when cold because the PCM is commanding the IAC to open, but once the engine is warm, the PCM wants to close it but its not closing, thus causing a "vacuum" leak and P0300 and stalling conditions.
I replaced the iac and problem is still there. I unplugged the crank and cam position sensors to check for corrosion but they were both clean. I plugged back in, started car and the misfires went away. Go figure. Bad connection? Intermittent sensor? And....which one? I wish I would have done one at a time.
Any suggestions? Thank you again.