SRC Turbo II

I recently bought an 87 Turbo II and I got it running in about an hour. the only problem now is that it will NOT idle by itself once its warm. The only way I could get the car to idle at all was to adjust the TPS screw so that it wasnt right but even then once it warmed up it tried to idle at like 600 rpm. What makes this even harder to fix is that when it gets up to operating temp, if I let it die it will NOT start again. That means I have to wait about an hour and come back and try again. I checked the BAC valve solenoid, its good. Any idea what else it could be?

SRC Turbo II

Ive been using http://www.teamfc3s.org/info/articles/idle.html . hen I tested the BAC connectors I got a very low AC voltage. It says this means the ECU is bad. ECU is fairly new though. Could it only be the ECU and if so where can I find more info on the transistor to replace?