What are the reasons for unstable idle speed during cold start of a car?

[King]

The reasons for unstable idle speed during cold start of a car are: 1. Oil accumulation or excessive carbon deposits in the throttle body; 2. Weak spark from the spark plugs; 3. Clogged fuel lines or faulty intake pipes; 4. Sensor failure causing the ECU to lose control; 5. Blown fuses or faulty ignition modules; 6. Low-quality fuel. The car throttle body is a controllable valve that regulates air intake into the engine. After entering the intake pipe, the air mixes with gasoline to form a combustible mixture, which then burns to generate power. The method for cleaning the throttle body is: 1. Turn off the ignition switch and disconnect the negative terminal of the battery; 2. Remove the throttle cable, intake hose, and screws securing the throttle body in sequence; 3. Clean the throttle body with a cleaning agent, and use a cotton swab to wipe areas that are hard to reach.