What will happen if the car air filter is not changed?

I believe everyone knows that the air filter needs to be replaced regularly during the use of the car, otherwise it will have a certain impact on the car. What will happen if the air filter is not replaced? 1, vehicle idling is unstable. If the air filter is not replaced for a long time, it will easily lead to unstable idle speed of the vehicle. At the same time, there will be obvious violent shaking and black smoke from the exhaust pipe. 2. Gasoline can't burn completely. The dirt accumulated in the air filter will lead to air blockage, poor circulation and reduced air intake of the engine. Therefore, the engine power of the vehicle will obviously decrease, the fuel consumption will increase, and even the throttle carbon deposit will be more. 3. The filtering effect becomes worse. If the air filter is not replaced for a long time, it will lead to dust and impurities blocking the filter element, which will lead to the filter element becoming very dirty and the filtering effect becomes worse. At the same time, fine dust in the air will directly enter the combustion chamber of the engine from the trachea, causing serious wear and tear of the engine cylinder.