Re: backfire - HELP!
If the backfire is when slowing down, de-accelerating, the cause is usually air being sucked into the exhaust where the muffler meets the exhaust manifold. That's not to say intake air leaks, ignition issues or carb. mixtures aren't adding to the mix. Bottom line, tailpipe backfire is unburned fuel, reigniting after the mixture leaves the cylinder.
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