Problems for specific Pontiac Grand Prix years:
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Newest reported 1991 Pontiac Grand Prix problems
The engine vacuum hose to the MAP sensor may crack resulting in a vacuum leak causing the engine to run rough and/or stall.
An engine oil leak may develop from the oil pump drive O-ring. This can often be confused with an intake manifold gasket leak. Careful inspection is required to determine the exact cause of the leak. Replacement of the failed 0-ring will commonly correct this concern.
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.
The timing chain tensioner and guides are prone to wear and may develop an abnormal noise, requiring replacement.
The fuel pump may fail causing engine to stall and not restart.
The rubber section of an automatic transmission cooler line may develop a fluid leak . In some cases the leaking section of hose can be replaced. In others, the complete cooler line must be replaced to correct this concern.
The high pressure power steering hose will commonly leak fluid; it should be replaced.