Rough and/or High Idle Due to Engine Vacuum Leak on Buick Regal

The upper intake manifold gasket and/or a PCV vacuum lines/hoses can develop vacuum leaks with age. This type of leak can result in a higher that normal or rough idle.

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Average mileage: 143,000 (126,000–160,000)
Engines affected: 3.1L V6, 3.8L V6 Supercharged
5 model years affected: 1990, 1991, 1992, 1993, more1999
7 people reported this problem
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1993 Buick Regal - 3.1L V6 126,000 mi,
check eing light on reads vac leak detected