Re: HELP....92 4.3 CPFI Probs!
Kinda sounds similar to a problem I have had twice before. In my case it was a sticking EGR valve due to carbon fouling. It happened to me about 2 years ago, and also just last week as I was driving from CA to TX. The symptoms were lousy mileage, very rough idle, and a funny smell coming from the exhaust.
The frst time it happened, A GM mechanic just removed the EGR valve and cleaned it. Everything went back to normal. This last time, I just sprayed 1/2 a can or carb cleaner down the intake and after driving a couple of miles, it cleared up. Hope this helps.
93 S-10 4DR Blazer Tahoe 4X4, 5" suspension lift, 33X10.50 BFG AT's, 'glass front fenders.