Alright when I turn on my car it shoots to about 3k, then it will drop to 1k then back up to 2.2k and it will keep going from 1k-2.2k.. When I let it roll by its self in gear it will raise to 2k then drop like someone slammed on the brakes to 1k and then raise again to 2k. and it will do this over and over.. When I hold the gas lightly it will jerk like crazy. If I take the TPS off it will run fine except the idle will be at 3.5. If i try to adjust the idle screw nothing happens. If i take the IAC it think that thing behind the manfifold off it will have a very lopey idle like a V8 sounds cool but not driveable. any ideas? This happened after I put a 91 manifold + PnP head on. I have a 92 LS.