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Pontiac Grand Prix Rough Idle

Learn if it's a simple fix or time to seek out a trusted technician.

What are common reasons my Pontiac Grand Prix has a rough idle?

While there are a variety of reasons your Pontiac Grand Prix has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
34%
of the time it's
Vacuum Leak
21%
of the time it's
Spark Plugs
15%
of the time it's
Ignition Coil

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Related Pontiac Grand Prix Questions

See what others are asking about their Pontiac Grand Prix. Get answers from RepairPal's community of auto experts and enthusiasts.
Replaced iac, unclogged purge valve solenoid, disconnected maf(no change). still fluctuates
Installed new plugs and wires ,injectors cleaned throttle body code reads plug 4 fault so i changed it yet again also...

Related Pontiac Grand Prix Problems

Find the most common driver-reported problems that are to blame when a Pontiac Grand Prix has a rough idle.
The upper intake manifold gasket and/or a pcv vacuum lines/hoses can develop vacuum leaks with age. this type of leak...
A stalling issue may occur if the battery goes dead or is disconnected and the "idle learn" procedure is not perform...
Pontiac Grand Prix Repairs and Prices
All costs based on RepairPal Fair Price Estimate™ averages. Actual prices may change depending on final diagnosis.

Pontiac Grand Prix Rough Idle Repair Symptoms

A failing ignition coil will create misfires in the engine, and lead to hesitation, extreme power loss, engine stalling, poor fuel mileage, and illumination of the check engine ...Read More
As we discussed, spark plugs are necessary for any gasoline engine to run. When they fail, the engine is in a constant state of attempting to ignite air and fuel, but cannot. Th...Read More