What are the causes of noticeable car shaking?

[EmmettLee]

The causes of noticeable car shaking are: 1. The engine throttle is too dirty or the fuel injector has excessive carbon deposits. The gasoline sprayed by the cold start injector will be largely absorbed by the carbon deposits, resulting in an excessively lean mixture during cold starts and difficulty in starting; 2. Poor performance of the ignition system, including spark plugs, high-voltage wires, and ignition coils; 3. Abnormal fuel supply pressure, incorrect intake pressure values, and malfunctioning sensors. The solutions for noticeable car shaking are: 1. Clean the fuel system and check the idle speed motor to remove carbon deposits; 2. Check if the spark plugs have excessive carbon deposits and replace them if necessary; 3. Check the fuel pressure and replace faulty components.