13 Reasons Your Car's RPM Goes Up and Down at Idle Easy Fixes Included

Make your car last 300,000+ miles and avoid expensive dealer repairs with The Mechanics Bible 101: https://themechanicbible.com/ If your car's RPM rises and falls while idling, it's often a sign that something in the engine or air-fuel system needs attention. While some causes are minor and easy to fix, others can lead to poor performance, reduced fuel economy, or unexpected stalling if left unchecked. In this video, we'll cover 13 common reasons your engine idles unevenly, explain how to diagnose each issue, and share practical fixes that can help restore a smooth, steady idle.