1, fuel system problem: fuel system failure or insufficient fuel supply will cause the vehicle to slow down. It is recommended to check the fuel filter, fuel pump and other components to ensure the normal fuel supply.
2. Air filter problem: The air filter is too dirty or ineffective, which will lead to insufficient air supply, which in turn will lead to vehicle deceleration. It is recommended to check whether the air filter needs to be replaced or cleaned.
3. Ignition system problem: If the ignition system fails, such as aging of the ignition coil and carbon deposition in the spark plug, the vehicle will lose speed. It is recommended to check whether the ignition system works normally and replace parts if necessary.