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.
of the time it's
Vacuum Leak
of the time it's
Spark Plugs
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 can create several symptoms: Check engine light comes on Engine runs poorly or stall Increased emissions Reduced fuel economy Car won’t start I...Read More
When spark plugs fail, the engine will struggle. The check engine light will come on, and it may appear either solid or flashing. The driver would likely notice one or more of t...Read More