The replacement did the trick. It is pretty easy to install.
The idle air control valve is broken, there will be a large smell of gasoline when the car is hot, and the idle speed of the car will become unstable, sometimes high and sometimes low. Too high idle speed will increase the fuel consumption of the vehicle; At the same time, the higher the idle speed, the greater the CO and HC emissions of the vehicle, so it will also increase the vehicle exhaust emissions. If you change the products of this store, there will be no such problems at all.