Posted on 4/28/2025
A rough idle isn’t only annoying but also a sign that something isn’t right under the hood. Whether your engine feels shaky, sounds uneven, or fluctuates in RPMs while sitting still, a rough idle can point to a variety of issues. Some are simple to fix, while others may require more in-depth diagnostics. Either way, it’s not something to ignore for long. Here’s what causes a rough idle and how to start narrowing down the source. Rough Engine Idle Your car should idle smoothly when it’s in park or stopped at a light. The engine should hum steadily at a consistent RPM, usually between 600–1000 depending on the vehicle. If your engine sputters, shakes, stalls, or the RPM needle bounces, that’s considered rough idling. A rough idle can affect your fuel efficiency, lead to poor performance, and, in some cases, even prevent your car from starting. Dirty or Faulty Spark Plugs One of the most common causes of rou ... read more