What are the symptoms of a faulty throttle in a Ford Focus?

[Haymitch]

Ford Focus throttle failure symptoms mainly include: Unstable idle speed: The engine idle speed is unstable, high idle speed persists without dropping, and the engine is difficult to start, especially difficult to start when cold. Insufficient power: Insufficient power, poor acceleration performance, and unstable operation. Increased fuel consumption: Black smoke from the car's exhaust pipe and increased fuel consumption. Throttle introduction: The throttle, also known as the air valve or throttle valve, refers to the control device that regulates engine power. In piston aircraft engines, the throttle controls the opening of the carburetor throttle valve to regulate the filling volume of the cylinder, thereby determining the engine's output power.