my car give a small vibration and this rpm but if I raise it just below 1000 I don't feel it any ideas what cause this at idle motor mounts brand new even with a fresh tune up it still happens. any WHY YOUR CAR SHAKES WHEN IDLING If your car feels smooth while driving but starts vibrating or shaking at a stoplight, something isn't right. At idle, the engine runs at its 2015 car vibrating at idle, RPM 500 WHY YOUR CAR SHAKES WHEN IDLING If your car feels smooth while driving but starts vibrating or shaking at a stoplight, something isn't right. At idle, the engine runs at its Why Does My Car Shake When Idle? Top Reasons and DIY Fixes