Bad take off and driving

1987 CHEVROLET CORVETTE
111,500 MILES • 0.5L • V8 • 2WD
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KENNETH SARSYCKI
  • MEMBER
  • 8 POSTS
My car will start, but after warming up it falls on its face sometimes back fires in intake. If you give very little gas it will get up to any speed you try but step on the gas and you have to play with gas to get back. I have replaced filter pump and cleaned MAS.
Air flow and found one vacuum line off.


Any help would be great!
Jun 3, 2017 at 9:11 PM
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STEVE W.
  • CAR REPAIR CONTRIBUTOR
  • 15,148 POSTS
Classic sign of a plugged exhaust system. The easing on the throttle lets the lower flowing system work, but when you step down fast the exhaust can't get out and you lose power. Do a back pressure test on it, you would like less than 2psi at idle and less than 4psi at 2000 rpm, higher indicates a blockage.
Jun 4, 2017 at 1:39 PM
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