What are the symptoms of Fox's throttle failure?

The main symptoms of Fox's throttle failure are: 1, unstable idle speed: the engine is unstable at idle speed, and it is difficult to start the engine, especially the cold start. 2. Insufficient power: insufficient power, poor acceleration performance and unstable operation. 3. Increased fuel consumption: The fuel consumption of black smoke discharged from the automobile exhaust pipe increases. Brief introduction of throttle: throttle, also known as throttle, refers to the control device that controls the engine power. On the piston aero-engine, the throttle valve controls the throttle opening of the carburetor to control the cylinder charge, thus determining the output power of the engine.