What is causing the vibration issue in my 2002 Mini Cooper S after replacing engine mounts and spark plugs? Resolved] Rough idle when car is warm Mini Cooper Forum This Mini Cooper came in with an engine mis, running on three cylinders. , We diagnosed the car to have a faulty ignition coil. We replaced ignition coil and spark plugs. , The car is now running Dont Ignore the Shudder Professional Diagnosis and Solutions for Mini Cooper Steering Wheel Vibrations 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