Like it says my truck starts and runs fine. I come to a stop light and it while idle for about 20 - 30 seconds and just shuts off. It will start right back up and off I go.
It's a 1992 K1500 5.7 liter Mostly stock. Shorty headers, TBI mods, 1 inch tb spacer. MSD wires and coil.
Any Ideas of where to start looking testing? Any one else have this Issue?
Its driving me nuts!
Update: truck idled all day in park and neutral. Idle for 20-30 seconds in all gears.
When that was happening to my truck, (I also had some high-speed misfire, though) it was the pickup coil in the distributor. The magnet on the coil cracks, and the pickup signal becomes weak. I had random stalling mostly at idle, but sometimes while driving.
Total failure happened 250 miles from home. GM dealer installed new main shaft in distributor.
Could be a bad o2 sensor.
Same vehicle, years after the distributor repair: O2 sensor was old enought that it would drop out of closed-loop at idle.
I'd have never known from the way the truck ran except I connected a scan-tool to diagnose something else, and found the sensor wasn't active at idle.
I think you could disconnect the wire from the O2 sensor at idle. The engine shouldn't stall--may or may not set a code.
