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.
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Sometimes a vacuum leak will whistle or hiss and make itself obvious. Vacuum leak 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.
Vacuum leak are not as common as other car problems, but they do happen. However, you may not always realize you got a vacuum leak and spend time and money trying to find what’s wrong with your engine.