Why Does Your Engine Vibrate at Idle? Noticing your engine shaking or vibrating while idling? This could mean something isn't right under the hood. Here's what might be causing it and how 10 Causes For Shaking Vibrating The Car Engine at Idle While Stopped What could be the cause of engine vibration when idling? Why Does My Car Shake When Idle? Top Reasons and DIY Fixes 2015 car vibrating at idle, RPM 500 WHY SOME ENGINES IDLE ROUGHER THAN OTHERS Some cars idle like a sewing machine others shake, pulse, and sound angry even when standing still. That difference is all about engine