Posted on 4/15/2026
A rough idle is one of those issues drivers notice quickly but do not always understand. The car shakes at a stop, the RPM feels unstable, or the engine sounds off. Since the vehicle still drives, many people hesitate to act right away. That delay is where confusion builds. Rough idle can come from several systems, so asking the right questions helps narrow down the cause and avoid unnecessary repairs. 1. Why Does My Car Idle Rough At A Stop? A rough idle usually means the engine is not running evenly across all cylinders. That can be caused by worn spark plugs, weak ignition coils, airflow issues, or fuel delivery problems. The car may feel fine once you start driving, which is why it gets overlooked. The idle condition still points to something that needs attention. 2. Can Bad Spark Plugs Cause Rough Idle? Yes, worn spark plugs are one of the most common causes. As they age, they lose the ability to ignite fuel consistently. That uneven combus ... read more