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Chevrolet Silverado 3500 HD Rough Idle

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

What are common reasons my Chevrolet Silverado 3500 HD has a rough idle?

While there are a variety of reasons your Chevrolet Silverado 3500 HD 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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See what others are asking about their Chevrolet Silverado 3500 HD. Get answers from RepairPal's community of auto experts and enthusiasts.
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Chevrolet Silverado 3500 HD Rough Idle Repair Symptoms

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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