Intake manifold or PCV valve hose may develop engine vacuum leak on Pontiac Firebird

The intake manifold or PCV valve hose may develop an engine vacuum leak causing a rougher than normal idle am may result in illumination of the check engine (SES) light.
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Average mileage: (–)
Engine affected: 3.1L V6
3 model years affected: 1990, 1991, 1992
3 people reported this problem
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