Nissan Qi Jun can't afford to refuel. What is the problem of unstable idle speed?

There are many reasons for idling instability and jitter, especially when the cold car just started, which is often caused by too much carbon deposition on the throttle. This needs cleaning and matching! Ignition system and oil circuit failure, valve train wear, EGR valve stuck, abnormal sensor signal, poor line contact, etc. It will cause unstable idle speed, so it is best to find a professional to check it! If there is something wrong with the car, ask the car master. 4S shop professional technician, 10 minutes to solve.