My 91' 4.3 TBI S-10 pickup has this nasty habit of dieing on me after I let off the gas and come to a stop. I have checked the IAC, even cleaned the pintle end but this did not help it. I downloaded WinALDL and watched the engine parameters while I drove and checked that Yes, the IAC is moving and appears to be working. (Confused??) The final wierd part of this is that during my testing, I slipped the ECM into ALDL mode and the truck NEVER DIED! It ran VERY smooth. So, now that I am confused, could it be something else. Bad injectors?, ..... Has anyone else had this problem. The truck has ~150,000 on it and had a tune up a little while back, (plugs, wires, cap, rotor, TPS sensor). BTW it is a 5 speed truck.