well actually, I calibrated the tps a few days ago... it's a perfect .500 volts at closed throttle and it reads a smooth voltage increase to appr. 4.8 at WOT... i've changed the iacv, changed computers and replaced cap and rotor.... right now i'm completely perplexed... any other ideas guys¿¿¿¿... I definately have been doing a whole lot of trouble shooting... just wanted to know if anyone has heard of this problem because it's got me stumped.... i thought it could be the tb, but at closed throttle when the rpm's are coming down after being on the throttle, it tends to stay at 1800-2000 and jump around... although if i hit the gas really quick, it drops fast enough to sometimes get through that spot and idle normally... with the GSR computer the problem isn't as bad, when i accelerate slowly the car jumps at those rpm's, but only sometimes... with the skunk2 program (p2 it does it really bad and wants to always idle/jump around at those rpm's.... so i'm guessing it's electrical, not vac/throttle related... any other suggestions??