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Chevrolet Cobalt Rough Idle

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

What are common reasons my Chevrolet Cobalt has a rough idle?

While there are a variety of reasons your Chevrolet Cobalt 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 Chevrolet Cobalt Questions

See what others are asking about their Chevrolet Cobalt. Get answers from RepairPal's community of auto experts and enthusiasts.
Usually happens when i back out of drive way and start going forward or when i am tuning at intersections. does not d...
When stopping car stalls or ideals rough, car idles fine in park.also car accelerates fine.

Related Chevrolet Cobalt Problems

Find the most common driver-reported problems that are to blame when a Chevrolet Cobalt has a rough idle.
The ignition module or an ignition coil may fail causing an engine misfire, the check engine light may or may not ill...
Chevrolet Cobalt Repairs and Prices
All costs based on RepairPal Fair Price Estimate™ averages. Actual prices may change depending on final diagnosis.

Chevrolet Cobalt 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