I have a '97 Jimmy 4.3L. A while back I was getting Code P0507 "Engine Idle Higher than Expected" So, I pulled off the IAC Cleaned it and still no change. I replaced it, and still no change. My Idle at park is around 900-1000, not terribly high, but still too high. I also notice that it takes a bit more time for the idle to come down when I am coming to a stop. I have checked the Vaccuum lines and they all seem to be ok, I have also cleaned out the EGR. So I am Stumped. If anyone has any suggestions, I would appreciate it!