Is your car vibrating when idle? Here's when you should be worried Car Shakes at Idle? Common Causes & How to Fix it 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 What could be the cause of engine vibration when idling? 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