camaro1185

I have a mainly stock L98 with a T56 swapped in this past winter. I'm running a Vette M6 bin with all the spark/fuel/scaler etc tables from my original bin. I have about 700 problem free miles on the car but now it is starting to "idle hang" anytime I put in the clutch. If I'm driving down the road, lift off the throttle and push in the clutch, the rpm's rise slightly (maybe 50) and then stay at that rpm even though the clutch is in and car is in neutral. If I lift off the gas and let it coast from whatever speed/rpm without putting the clutch in, it will engine brake and the rpms will slowly drop as the speed decreases. If I am close to a stop, but still rolling and put the clutch in, again 50 rpm rise and idle hangs there. The only way to drop the rpms is to blip the gas, that brings it back down to idle. What could that be, tune? IAC? worn TB etc?

camaro1185

I did a datalog, and may have found the problem. Every time I lift off the throttle, the TPS voltage stays at the previous voltage that it was at while I was on the gas. I would assume that when I lift, the TPS voltage should immediately go down to the "closed" voltage reading (.57v on mine) and it doesn't.

Its acting exactly like cruise control when I lift off the gas.