Why does the car shake severely at idle?

[LeBraxton]

Here are the possible reasons why the car shakes severely at idle: 1. Severe engine carbon deposits: It may be caused by excessive carbon deposits inside the engine, making it difficult to start the vehicle and causing idle shaking. 2. Ignition system failure: Problems with the vehicle's ignition system require checking the spark plugs and high-voltage wires. Abnormal operation of the ignition system can lead to this situation, resulting in idle shaking or difficulty starting. 3. Dirty throttle: Unstable fuel system pressure or malfunctioning fuel pump can prevent proper fuel supply to the engine, leading to poor fuel atomization or failure to open the injectors, causing cylinder misfire shaking or failure to start. 4. Engine cylinder malfunction: Insufficient cylinder pressure due to the engine exceeding its service life can result in intermittent idle shaking.