It could cause it to stall. The booster is powered by engine vacuum and if it leaks, that could cause it to stall at idle.
migration_judge_roy answered 11 years ago
Keeps suckin' air--the air that would have been used to make the motor run right...but if your failure has choked the air off, there will be no change in the engine's performance.
brakes hard and stalls when you put it in gear
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