What should KIA Maxima do when its idle speed is between 1500~2000?

The reason for the high and low idle speed is: 1. Impurities in the air and sludge produced by gasoline make the throttle of the vehicle dirty, and the idle motor does not work well. 2. Throttle carbon deposit, nozzle atomization combustion is not sufficient. 3. The exhaust pipe is blocked, resulting in poor exhaust. 4. Air leakage leads to insufficient vacuum. 5. Insufficient cylinder pressure and serious automatic wear. Go to the S store as soon as possible to investigate and deal with it.