Last summer I bought a used 99 S10 4x4 with the 4.3 eng and 5sp trans. After a few weeks of driving to and from work I noticed that at a constant speed the eng would lag or stumble ever so slightly. This happens every 30-45 seconds. The truck has been to 2 repair shops. #1 changed the fuel filter. #2 did complete tune-up, new plugs, clean injectors,etc, also new cat converter ($$$). Both mechanics road tested the rig and felt all was fixed. Well the problem is still there. I noticed that in the mornings when I have the defroster on this hesitation happens. When the defroster is off the truck runs as new. ??? I did notice that when I set for defrost the AC compressor cycles on-off every 30-45 seconds. What's up??? this is driving me NUTS!!! LOL Dave
- posted
20 years ago