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 What could be the cause of engine vibration when idling? At Idle And Red Lights Im Getting A Small Vibration Is That Normal For A 2018 Terrain SLT 2.0, Dont Here Any Odd Noises But Seems Like It Shouldnt Only Have Had The Car A Few Days. Brandon Why Does My Car Shake When Idling? AutoGuru