Why does car RPM fluctuate while idling?
Why does car RPM fluctuate while idling? Why does my engine's RPM seem to fluctuate (runs rough)? Many engine performance problems can be linked to maintenance issues such as stale fuel, dirty air filter, fouled spark plug, and deteriorated oil. Engine hunting and surging at idle is usually caused by a fuel delivery, air leak, or governor system problem. Why does my engine RPM fluctuate at idle? Below are a few explanations as to what might be the issue and cause for that fluctuation. In older cars, your spark plugs might just need replacing. A quick tune-up can greatly help...