I have been haveing an idle issue with my stang, it jumps between 400-650, when i unplug the IAC it dies, and when im at stops, put it in reverse, or turn the wheel at a stop the rpm's drop to like 400, please any help would be great!!!!!
I had an idle problem it was idle really ruff and would drop rpms mine just ended up being a plug wire you could give that a try or there is a crank shaft sensor and see if that is bad take it to an autozone and have them run the test it is free hope it helps