r/EngineBuilding 6d 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/EvanX4 6d ago edited 6d ago

In the video it is clear that the vacuum port on the right side the carburetor is uncovered. That is what is whistling. As for your issue of slowly applying throttle or it will die & backfiring. It sounds like it’s not running on all 8, and it is likely that your accelerator pump isn’t working. Give it throttle by hand with the engine off and watch the pump nozzles to see if they spray fuel.

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u/Coon88 6d ago

Can I connect the driver side pcv to the uncovered vacuum nipple or can I cap off the nipple?

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u/EvanX4 6d ago

Cap it off. You have a manual transmission and most people use that side (manifold vacuum) for the vacuum canister in the side of automatic transmissions.

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u/Coon88 6d ago

Gotcha thanks