1997 Chevy Truck backfiring at driving speed

1997 CHEVROLET TRUCK
172,000 MILES • V8 • 4WD • MANUAL
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CARP 76
  • MEMBER
  • 1 POST
engine runs extremly rough while holding any speed. i have replaced plugs and wires, coil pack, fuel filter, and cleaned egr. still the same so i replaced the egr with a used one from junk yard. seems to run better when air temp. is cold warmer temp the rougher it will run. sure could use some help.
Feb 13, 2008 at 5:10 PM
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MASTERTECHTIM
  • CAR REPAIR CONTRIBUTOR
  • 4,750 POSTS
sounds like a cpi problem or you still have carbon holding open the egr. does it have any codes? do you know the fuel pressure? is the timing changing?
Feb 13, 2008 at 5:14 PM
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