Why is the car shaking violently?

[DiBeckett]

Further diagnosis is required to determine whether the severe shaking occurs when the engine is idling after startup or when the vehicle is in motion, as different conditions require different inspection approaches. Possible causes of severe car shaking include: 1. Ignition system issues: Faults in the car's ignition system can lead to poor ignition performance or weak spark plug firing, resulting in unstable idling. 2. Worn or loose engine mounts: Engine mounts are rubber blocks placed between the engine and the frame. 3. Carbon buildup problems: Carbon deposits can accumulate in the cylinders, throttle body, spark plugs, and intake system.