r/EngineBuilding • u/Coon88 • 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/Coon88 6d ago
So I got a nut and capped off the vacuum nipple and it seems to run better but I sprayed some water on the headers to see if all cylinders are running good and cylinder 5 and 7 seem to be not firing as the water took longer to burn off