I have a 1994 Chevy 1500 with a 4.3 that’s been having issues. Within the past year it’s had fuel pump, fuel filter, and spark plug wires replaced. Within the past 3 months it’s had plugs, new throttle body, gaskets, injectors, air filter all replaced. I cleaned EGR valve and tested the EGR valve vacuum solenoid. Checked the distributor cap and rotor, checked for fuel, for spark, for pulse. Everything was good. In a last ditch effort, I replaced the computer (wasn’t convinced it would solve it but as I said, last ditch effort. Not a single mechanic I know, even in my shop, could give me any other ideas what may be causing the issue.) And no, replacing the computer did not help.
The problem it’s having is it will run fine for a few minutes and then it will act as if it’s either being starved for fuel, so the injectors will spray more than they need to, and then they’ll back down and spray a little, then spray a lot again, then back and forth like that until it just stops, then it dies. Then when you go to start it back up the injectors don’t spit any fuel. Try starting it a little later and it will start up just fine and run fine for a few min, then the issues start again. The most confusing part about it is there will be times that it runs perfectly fine. Just a few weeks ago I was able to drive it around town. Then two days later I went to drive it to work and it started doing this again.
Any advice or suggestions?
Not a single mechanic I know can think of anymore possible solutions. I’m a mechanic, the guys I work with in the shop, my other friend mechanics, even my teachers can’t think of what more I can try to get this damn thing running…