Rough Idle When Stopped
Your engine shakes, surges, or feels uneven while sitting at a stop or idling. A rough idle usually points to ignition, fuel, or air problems that throw off the engine's balance.
Find a TechnicianCommon causes
- Worn or fouled spark plugs
- Dirty throttle body or idle air control valve
- Vacuum leak in the intake
- Clogged fuel injectors
- Faulty oxygen or MAF sensor
- Dirty air filter restricting airflow
Frequently asked questions
Can a rough idle damage my engine?
A mild rough idle won't cause immediate damage, but the underlying cause — like a misfire or vacuum leak — can worsen and harm components over time.
Why does it idle rough only when cold?
Cold rough idle is often normal as the engine warms up, but if it lasts too long it can mean worn plugs, a weak sensor, or a fuel mixture issue.
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