backfire

fishermt

Registered User
We just rebuilt the engine in my 89 SC and are having some annoying problems. The engine runs great at idle and even at high RPMs, but it backfires and misses on the way up and down. The timing has been adjusted in the prescribed manner, so I doubt that is it. We're a little sketchy about the vacuum system, especially the MAP sensor. If anyone has any advice, it would be greatly appreciated! We put a S-flow supercharger from a 94/95 on, I don't know if that makes any difference.
 
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