Quote:
Originally Posted by eagle
Sounds like a manifold leak. Take an LP torch, unlit, and direct the gas around the manifold gasket area while idling the engine. You'll hear the RPM increase if you have a leak.
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this works good to find a vaccum leak.
when it backfired through the carb it must have cleaned some some crap from a jet inside the carb.
pull the carb off and make sure it is clean and assembled correctly.
backfire through the carb could be too lean.
flames out your exhaust could be retarded timing.
ou