GMC Sierra 2500 Rough Idle

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

What are common reasons my GMC Sierra 2500 has a rough idle?

While there are a variety of reasons your GMC Sierra 2500 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 GMC Sierra 2500 Questions

See what others are asking about their GMC Sierra 2500. Get answers from RepairPal's community of auto experts and enthusiasts.
I haven't found a vaccum leak, cleaned iac and it still shows codes 171/174.
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Related GMC Sierra 2500 Problems

Find the most common driver-reported problems that are to blame when a GMC Sierra 2500 has a rough idle.
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GMC Sierra 2500 Repairs and Prices
All costs based on RepairPal Fair Price Estimate™ averages. Actual prices may change depending on final diagnosis.

GMC Sierra 2500 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