What's the impact of a broken accelerator?

The bad throttle of the car has the following effects: 1, the engine idle speed is unstable, the high idle speed keeps decreasing, and it is difficult to start the engine, especially the cold start; 2, the engine idle speed instability or no idle speed; 3. The engine is difficult to start; 4. Insufficient engine power, poor acceleration performance and unstable operation; 5. The exhaust pipe of the car emits black smoke, which increases fuel consumption.