DavidNC

This is for a 97 LT1 M6. On cold initial cold start up, car starts fine and idles fine until driven. Idle then goes up to 2000-2200rpms until stopped then drops to 1500rpm's. It will do this until the car is turned off and back on, then high rpm is about 1200 and stopped rpm is about 1000rpm. No codes. I'm stumped. Any ideas. It has the trottle body water bypass.

DavidNC

What? No ideas?

Well, if I don't get any better ideas, I will take off the trottle body and clean everything off and check out all the parts. If this doesn't work, I may take a big leap and convert to OBD1 so I can run diagnostics and program for cheaper than the OBD2, then swap back to OBD2 for emissions.

Any ideas before I leap into this? Perhaps the AIC can be reset without removing the TB.

Thanks