Rough and/or High Idle Due to Engine Vacuum Leak on Chevrolet Lumina

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 73,500 (56,000–91,000)
Engines affected: 3.1L V6, 3.4L V6
9 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 2001
17 people reported this problem
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Problem developed after replacing temperature sensor. Found vacuum leak on PCV line where it "T"s into throttle body/Intake. Replaced Vacuum line.