Fox's idle speed is unstable, up and down.

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 4s shop or repair shop as soon as possible for investigation and handling.