Posted on 2/28/2025
When your car is idling, you expect the engine to run consistently without excessive vibrations or erratic movements. But if you’ve noticed your vehicle shaking at stoplights or your RPMs fluctuating unexpectedly, there may be an issue that needs attention. A variety of factors can cause a rough idle, some minor and others more serious. Understanding the potential causes and warning signs can help you address the problem before it leads to costly repairs or even engine failure. What Causes a Rough Idle A properly functioning engine should maintain a stable idle, but when something disrupts its balance, you may experience vibrations, unusual sounds, or inconsistent RPM levels. One of the most common reasons for a rough idle is a dirty or failing spark plug. Spark plugs are responsible for igniting the air-fuel mixture in your engine’s cylinders, and if they become worn or covered in carbon deposits, misfires can occur. These misfires create inconsistent en ... read more