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Engine running great but a few misfires on decel

1703 Views 8 Replies 4 Participants Last post by  Sergio 69 SS396
So I've been getting on her pretty good as of late and having fun with my MJ467 beastly motor. I have her tuned pretty good. 18 degrees base timing, 36 degrees total timing all in by 3500 if memory serves. Idles at 1000rpm and makes 15" vacuum, which is how I like it. Holly HP4150 DP 750 carb needs a fine tune and maybe some new plugs. Today I noticed a few misfires on decel when I would let off the gas pedal on the freeway. Timing or carb or a little of both? Otherwise response is great and pulls through 5500 and scares me sometime haha.

Just thought I'd ask before I start messing with stuff this weekend. Gracias :thumbsup:
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Like a pop out the exhaust on decel and no foot on the throttle? I would check to make sure all the header bolts are tight to make sure you don't have a leak. Some decel pop is normal in my opinion.
Maybe check to see if you developed a crack in one of your mufflers. If so, could be sucking some air in which will cause popping.

What mufflers? I have Flowmasters and they decel pop a little as well.
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