[www451oa]

I've got a 94 S10 Blzr 4.3 A few years back I had the same symptoms and it turned out to be my CMFI Spider injector. It was flooding 2 of the cylinders causing my to run on 4 cylinders and use enough gas for 8. I had raw fuel coming out my exhaust which I could see in my rear view mirror when accelerating using the passing gear, on high RPM's. You said you changed it yourself. I never go to the dealer, I'd suggest finding a reputable Auto Electric shop. They've been a god-send for me when I'm not sure of what the hell is wrong.

Also, I just replaced my Fuel Pump, Sending unit and Tank. The fuel pump just up and died on me. The sending unit had some issues and the tank was starting to rot out and would have had to been changed soon.