Have a bog down at top speed

1996 CHEVROLET TAHOE
155 MILES
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TIEDYETIMMY
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  • 2 POSTS
96 Tahoe 350 engine Have a bog down at top speed. Does not bog down while idling or accelerating. Does not bog down while engine has cruise on. Replaced plugs, wires, cap an rotor an seems now to be better but not fixed?

Replaced plugs, wires, rotor and cap. Chug seems to be a bit worse now. Perhaps misfiring ?
Feb 20, 2012 at 9:14 AM
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CADIEMAN
  • ✓Experienced Mechanic
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Have u checked for a clogged exhaust or fuel filter?
Feb 20, 2012 at 9:41 AM
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TIEDYETIMMY
  • MEMBER
  • 2 POSTS
Exhaust flow seems normal. It only mis fires when at top speed. Not while idle or when accelerating. Wonder if it may be a fuel issue ? It seemed to get worse after the plug,wires, rotor an cap were replaced.
Feb 20, 2012 at 9:57 AM
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CADIEMAN
  • ✓Experienced Mechanic
  • 3,544 POSTS
hook up a gauge so u can see it while driving to check this
Feb 20, 2012 at 11:28 AM
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