June 9, 200421 yr I was wondering what this thing does and what kind of vacumm it recieves e.g. only when it accelerating or after a certain temperature is reached. Cheer
June 10, 200421 yr it let's air into the manafold when decelerating. it's either for better gas mileage or to prevent backfiring or both. and i think it's why my car has been backfiring since i put a weber on.
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