1989 Chevy Cheyenne

Did they check the fuel delivery system? Proper fuel pressure is what I'm getting at? Checked for vacuum leaks?

Yes, they ran through the entire fuel system. Checked for all vacuum leaks. Put a new computer in, new fuel pump, new fuel filter, swapped out throttle body, swapped out distributor assembly, new AIC, TPS, and plugs and wires. Bypassed EGR valve, only way to keep it idle. And had to raise the idle on it too. Still the truck will shut off the gas or whatever electrical part and stall. But I can engage the clutch and revve the engine a couple times and it will drive on.

What about checking the engine compression? Every thing has ben done for it to run properly, unless there is excessive slop in the timing chain.

I have not personally checked the compression on the engine. The Chevy dealership stated they did and all was fine. Engine has less than 40000 miles on it. I guess the timing chain could have some slop in it. I also have noticed that when the climate control is used the stall happens more often. Any way the dash wiring harness would cause the stalling?

This is beginning to sound electrical. 40,000 there is nothing going to be wrong with the timing chain or engine compression. Rules that out. 5 months at a dealership? And didn't get it right? WTF. I hate dealerships. Have you checked back with them, what do they say about this.

Neutral Safety Switch / Range Sensor or Clutch Pedal Position / Starter Safety Switch or Speed Sensor. The cruise circuits disengage when depressing the clutch, Cruise Control Release Switch or Cruise Control Switch. Any of these wiring circuit as-well. Ported Vacuum Switch, here is a way to loose your vacuum, fine when lean mixtures for idle and highway cruising (slow burn) but when rich mixtures & timing vacuum advance calibrations are needed to speed up (fast burn), no vac means no vacuum advance timing vacuum advance calibrations.

The HVAC uses vacuum too. You turn it on its start doing the symptoms. I may lean toward vacuum problems.

Rowefast: That was my thoughts as well. They wanted to charge me 2300 for doing nothing, in my opinion. I had to talk with the owner and they reluctantly took the labor off of the bill. I did go back by and talk with them about this and their words "it was running fine when it left here". So yes, I don't have much use for the local dealership anymore. Engine creator: I had thoughts that the safety switch my be faulty and will replace this weekend. The dealership said they pulled vacuum and all was well. However, after seeing their workmanship and given the truck is still not right...I will check the vacuum. Thanks guys! This gives me a new path to chase down the gremlins in my truck. It is appreciated!

We're hear to help, keep us informed.

Didn't you replace injector? The 4.3 has offset injectors/one shoots more than the other. I'm no pro maybe switch them around though might work.

GuruXD4JG: Thank you for responding to this feed. I had forgotten that I had posted on here. I did replace the injectors and had swapped them around like you suggested but that wasn't my problem with the truck. Turns out that the MAP sensor connector had a broken clasp on it. So the connector was not fully seated into the MAP sensor. An $18 pigtail fixed the problem! I have not had any problems since then. Goes to show...sometimes it's the simple things that can cause the biggest problems. Thanks again for taking the time to offer your advice on this. It's greatly appreciated!