Angola passed 120 without speeding up.

1. Carbon deposit: Carbon deposit here includes cylinder carbon deposit, throttle carbon deposit, spark plug carbon deposit, intake carbon deposit, etc.

2. Fuel system: Adding inappropriate fuel labels will lead to the decrease of vehicle output power and power.

3. Air intake system: Air is one of the power sources of the engine. If the air filter is not cleaned in time for a long time, the insufficient air volume will cause the combustible mixture to be too rich and reduce the engine power.