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If there are vacuum leaks, then the computer must shoot for a “fuel rich” condition to prevent running lean, which could damage the motor with pre-detonation.

Sometimes vacuum leaks will whistle or hiss and make itself obvious.

Vacuum leaks will disguise itself as an ignition or fuel problem that defies diagnosis. Either way, an engine vacuum leak is bad news because allows “unmetered” air to enter the engine and upset the air/fuel ratio.