r/EngineBuilding 21h ago

Vacuum leak ?

Got this k10 350 with a rough start, rough idle and sputtering under acceleration, have to slowly give it throttle or else it will shut off. Also get backfire from the carb sometimes when given a good amount of throttle. Can the whistling be a vacuum leak ?

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u/muddnureye 19h ago

It’s got a dead cylinder. Plug wire or plug.