Peugeot 207, 1.4 What if the idle speed is unstable?

I don't know how many kilometers your car is. Try cleaning the idle motor and throttle. If the idle speed fluctuates greatly, it is recommended to check whether the air intake system leaks, the throttle valve is clean and the water temperature information is normal. Idle instability is generally caused by dirty throttle, so it is recommended to clean the throttle and air intake first. Engine idling instability will be caused by mechanical failures of intake system, fuel system, ignition system and engine. Therefore, it is a wide-ranging and difficult job to diagnose the cause of engine idling instability, and it is not appropriate to replace parts easily. There are many reasons for the unstable idle speed, so we should make a correct judgment according to the test results, theoretical analysis and maintenance experience. @20 19