2002 Kenne Bell GT, stick shift, 4.6L, idles fine at 800, drive for 15 min and it idles at 1400. Shut car off, restart and idles back at 800 again. What would cause this? I dont know much about these cars so I havent checked anything yet. Thanks
Your Throttle position sensor is the black sensor on the side of the throttle body. These have been known to go bad and they arent very expensive to replace. The plenum right behind the throttle body has the IAC on the front of it. Just pull the bolts out and it comes off. Id take the throttle body off and pull the IAC off and clean them good with some throttle body cleaner (auto parts store)
Both pieces are cheap to replace and readily available online to order. Good luck, let us know if anything changes.