I have a 1996 chevy cheyenne C1500 with a 4.3L engine with 93,000 miles. I was driving and the check engine light came on and minutes later the car died. I can start the engine and it itles find but as soon as I press the gas pedal down it chokes, backfires and stalls. If I press the gas pedal down slowly it reves all the way up and I can hold it at that rmp. So, I assume the fule pump is ok. 6 months ago I replaced the spark plug wires and cap and rotor.
I changed the cap and rotor again because it was bad and the camshaft position sensor and that didn't work. Then I borrowed a computer and the codes said there was a problem with the MAP sensor. I replaced that and still no success. Then I changed the throttle position sensor and that didn't work.
I also changed the fuel filter. I erased the codes and the car runs fine at itle. I can rev it up extremely slowly but as soon as I press it down normally in park or drive it bucks, backfires and stalls.
I'm at a total loss on what it could be. Could it be the control module or MAF? The MAF looks clean and the wires are not broken. Please help.
Friday, October 19th, 2007 AT 9:57 AM