1997 Chevy Truck backfiring at driving speed

Tiny
CARP 76
  • MEMBER
  • 1997 CHEVROLET TRUCK
  • V8
  • 4WD
  • MANUAL
  • 172,000 MILES
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.
Wednesday, February 13th, 2008 AT 5:10 PM

1 Reply

Tiny
MASTERTECHTIM
  • MECHANIC
  • 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?
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Wednesday, February 13th, 2008 AT 5:14 PM

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