What's the performance when the throttle is broken?

What's the performance about "the accelerator is broken"? Introduce the following related contents:

The throttle is broken;

1, the engine idle speed is unstable, the high idle speed drops discontinuously, and it is difficult to start the engine, especially the cold start;

2, the engine idle speed is unstable or no idle speed, the engine is difficult to start, the engine power is insufficient, the acceleration performance is poor, and the operation is unstable;

5. The exhaust pipe of the car emits black smoke, which increases fuel consumption. Throttle fouling is mainly caused by oil vapor, followed by particles and moisture in the air. That is to say, when a qualified air filter is used and the crankcase ventilation pipe is removed, the throttle scaling speed will be much slower.