I never had a single idle issue with my car with the stock ecu. After swapping to the Evo8 ecu the idle is fine unless the A/C was on. Once I swapped to an auto trans I have idle issues if its not in drive.

So if I did not use A/C back when my car was a manual, the car idled at 750, no issues. If I had the A/C on for more than 15-20 miles, the idle would be much higher when the A/C was off (1-1.5k). This would stay high for awhile then go back to normal. This would happen repeatedly, not random.

Once I went auto, the car idles damn perfect when in gear (R,D,2,1). When in P,N the car idles at 1.5k and throws a CEL for Idle control failure.

I swapped ICS again (both tested fine, black ISC's), harness is fine.

Anyone else have this issue? Or something like this?

Its driving me up the god damn ####ing wall.