The idle speed of foreign exchange 1.8 is unstable, sometimes high and sometimes low. What is the reason?

There are the following problems. First, the throttle is dirty and needs to be cleaned and matched. Second, the vacuum tube is leaking. Check it. Three. Nozzle oil leakage or insufficient oil pressure. Four. The air temperature sensor of the water temperature sensor is invalid and damaged; 5. The carbon canister solenoid valve is damaged; 6. The spark plug did not ignite correctly. It is recommended to go to the maintenance point to check these aspects.