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My 91 Silverado 350tbi miss under load?

Tiny
BAINES48
  • MEMBER
  • 1991 CHEVROLET SILVERADO
  • 81,000 MILES
Misses under load (truck empty)
Wednesday, December 7th, 2011 AT 7:37 PM

5 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Miss under load first thing I would suspect is plugs and wires.
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Wednesday, December 7th, 2011 AT 8:14 PM
Tiny
BAINES48
  • MEMBER
  • 2 POSTS
Im thinking camshaft. Plugs, wires, rotor have been replaced and distributor cap
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Wednesday, December 7th, 2011 AT 9:32 PM
Tiny
SATURNTECH9
  • MECHANIC
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If it only misses under excelleration I wouldnt suspect a cam shaft that should effect at all different rpms. Usually when it happens under excelleration its a igniton issue. Is it worse with the ac on?Also how about your coil?
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Wednesday, December 7th, 2011 AT 9:48 PM
Tiny
BAINES48
  • MEMBER
  • 2 POSTS
The truck backfires through throttle body (TBI) when under load. Don't know what to check next? Cam etc.
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Friday, December 9th, 2011 AT 8:47 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Have you checked the ignition timing yet?
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Friday, December 9th, 2011 AT 9:35 PM

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