What's wrong with the unstable idle speed of Carey Youyou 472 engine?

Hello, I need to check whether the gap of the spark plug is too large, which will lead to poor ignition. 2 Whether the throttle and idle motor are dirty, and they need to be cleaned if they are dirty. 3 Whether the air intake system leaks air will lead to incorrect air intake data signal. 4 Whether there is air leakage in the valve. The timing is right. I hope my answer can help you, and I wish you a happy life! If there is something wrong with your car, ask the car mechanic. 4S shop professional technician, 10 minutes to solve.