it is usually held on with 2-4 screws, REMOVE AIR FILTER ASSEMBLY FIRST: (DIRECTIONS CALL FOR REMOVING FULL THROTTLE BODY.-I DIDNT NEED TO)remove the screws pull out and unplug harness. make sure original o-ring is removed as well. slide new IAC into opening on throttle body and tighten down. replug your harness. I have a '97 eclipse and mine was located right below the TPS( Throttle body Postition Sensor) It was fairly easy. 2-10 difficulty.