What are the causes of unstable idle speed and shaking?

[DiCassidy]

The causes of unstable idle speed and shaking are: 1. The vehicle's ignition system has malfunctioned; 2. Components in the ignition system have become loose; 3. Severe carbon buildup in the engine; 4. Aging of engine components; 5. Excessive carbon buildup in the throttle body; 6. The air filter has not been replaced in time; 7. Excessive carbon buildup in the fuel injectors; 8. Problems with the ignition system; 9. Unstable fuel pressure. Idle speed in a car is not a specific speed but rather an operating condition. When the engine is running without any load, it is referred to as idling. When the accelerator pedal is fully released while the engine is running, the engine enters the idle state. The engine speed during idling is called the idle speed, which can be adjusted by modifying the throttle opening size and other methods.