Rough and/or High Idle Due to Engine Vacuum Leak on Pontiac Grand Prix

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: 176,000 (176,000–176,000)
Engines affected: 3.1L V6, 3.4L V6
8 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 2000
13 people reported this problem
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