1985 Buick Lesabre stumbles on acceliraton at 45 or higher

1985 BUICK LESABRE
156,459 MILES • V8 • 2WD • AUTOMATIC
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TONE38
  • MEMBER
  • 1 POST
i have done a complete tune up and change my fuel pump but my car stills stumble and surge when i get to 45 or 50 mph i cant get pass that what else is there is it time to replace my timing chain
Feb 16, 2008 at 9:07 AM
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BMRFIXIT
  • ✓Experienced Mechanic
  • 19,053 POSTS
Check exhaust back pressure for catalytic converter flow
check tranny
check coil and wires
check fuel pressure
Feb 20, 2008 at 9:31 AM
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