Is this level of idle vibration and shift shock still acceptable? Is it time to replace the engine mounts? Anonymous participant Facebook R50 R53 Intermittent vibration North American Motoring 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 Car Vibrates When Idle: Major Causes and More dubizzle