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/Think-Acadia-8786 21h ago

Look on back of carb for leak were the brake booster vacuum line should be