my 91 silverado 350tbi miss under load?

1991 CHEVROLET SILVERADO
81,000 MILES
Avatar
BAINES48
  • MEMBER
  • 2 POSTS
misses under load (truck empty)
Dec 7, 2011 at 7:37 PM
Advertisement
Avatar
SATURNTECH9
  • CAR REPAIR CONTRIBUTOR
  • 30,869 POSTS
Miss under load first thing i would suspect is plugs and wires.
Dec 7, 2011 at 8:14 PM
Avatar
BAINES48
  • MEMBER
  • 2 POSTS
Im thinking camshaft. Plugs,wires, rotor have been replaced and distributor cap
Dec 7, 2011 at 9:32 PM
Avatar
SATURNTECH9
  • CAR REPAIR CONTRIBUTOR
  • 30,869 POSTS
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?
Dec 7, 2011 at 9:48 PM
Avatar
BAINES48
  • MEMBER
  • 2 POSTS
The truck backfires through throttle body (TBI) when under load. Don't know what to check next?? Cam etc...
Dec 9, 2011 at 8:47 PM
Avatar
SATURNTECH9
  • CAR REPAIR CONTRIBUTOR
  • 30,869 POSTS
Have you checked the ignition timing yet?
Dec 9, 2011 at 9:35 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.