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.
Average mileage: 127,000 (95,000–160,000)
Engines affected: 3.1L V6, 3.8L V6 Supercharged
9 people reported this problem
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check eing light on reads vac leak detected
Car idles rough (new spark plugs) cruze control lights up but doesn't work, heating, AC ducks come out on the floor, won't switch toc anything else.