Hi, I have a 1995 Chevy s-10 4x4 with 4.3 V6 TBII Z engine…228,000 miles.
The problem it has is when applying light throttle, it cuts out or bogs down, sometimes backfires through the throttle body.
It idles fine and revs fine at higher RPMs. It only does it when first applying gas from idle.
I have been to 3 mechanics so far…
First guy cleaned the fuel injectors and declared it fixed. I pick it up and it’s exactly the same
Second guy replaced the distributor and declared it fixed. I pick it up and it’s exactly the same.
I returned it to the second guy again. He had it for a week and didn’t know what’s wrong with it.
It’s now at a third mechanic for over a week and he still hasn’t looked at it.
I changed the spark plugs after the 2nd mechanic gave up. The old ones only had 22k on them. They were all very dirty and worn, 2 plugs had big blobs of crust on the electrodes. With new plugs, it actually ran worse, same problem only more pronounced.
The fuel filter is new, the wires are only a few years old. I also changed the TPS and made no difference.
The truck is still in nice shape. I haven’t been able to drive it for 2 months, this is my only vehicle… I don’t want to scrap it over something that could be fixed but I can’t waste much more time and money on it. Can somebody offer some guidance? Like what the problem might be? Or the name of a decent mechanic in southern NH who knows how to do diagnostics instead of guessing.