So the car is a 92 with a complete custom harness by guru joe, using a wet turbo from an xr4ti and an engine from an 86 SVO, and a LA3 computer and stingers front mount and the large vam and injectors with a cone filter on the end of the vam. That is the motor, anyways, when I start the car seems to idle fine, I put it into reverse, let out the clutch start to back up and have to keep goosing the throttle to keep it from idle searching and dying. That is only the begining. sometimes when I come to a stoplight the idle will chill around 1500, and the next light I come too it will idle around 800 a little rougher, the next light might be 1000, and then possibly the next light might idle search and die again. Car sometimes bucks while cruising on the freeway at a constant speed, Car feels very fast under WOT and once in a while will hiccup ( miss/backfire slightly) while I am accellerating hard. I can live with the hiccup but the random idling is driving me crazy. If the car begins to idle search I can rev it to like 4000 then the idle will stop searching and usually hover around 1100 fairly smoothly. I cleaned the IAC, the idle acts pretty much the same, searching even with the IAC unplugged! I also set the TPS voltage many times too. I tryed reseting the computer. Where should I look next, hopefully not a cracked head or blown headgasket, car is not overheating. Thanks for your suggestions.