Backfiring when let off gas

Newtoy78z

New Member
Sep 29, 2019
2
Just purchased a 78 Z28. I had the original exhaust manifolds replaced with headers and replaced both mufflers. She doesn’t miss a beat when idling just backfires when you let off the gas. Sounds like coming from driver side. Also sometimes she starts on 1st try other times takes a couples of tries. Any suggestions? Thanks
 

Vettenick

Vettenick
Jul 17, 2019
418
Just purchased a 78 Z28. I had the original exhaust manifolds replaced with headers and replaced both mufflers. She doesn’t miss a beat when idling just backfires when you let off the gas. Sounds like coming from driver side. Also sometimes she starts on 1st try other times takes a couples of tries. Any suggestions? Thanks
Other than the headers, is this car stock with any emission equipment still installed, like EGR ? Did you have this problem before the headers, or did it start right after the headers?
 




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