Ask for advice: how to deal with the phenomenon that the idling speed of modern Shengda engine is unstable and the power failure light is always on?

Hello! I am 10 Hyundai Xinshengda Cheyou. This car was produced in February 20 10, and was purchased in February 2020 1 10. At present, the mileage has just passed100000 km. The engine speed has been unstable in the last two months, and the power failure light has been on all the time, sometimes. Especially in recent days, the phenomenon of automatic flameout will occur when the idle speed is too low in the parking state. After many computer tests by the maintenance master, sometimes it shows that the system is too rich (1 exhaust) or the mixture is too thin or too rich when idling. After the computer is restored, the power failure light does not light up and temporarily returns to normal. This situation has appeared for more than two months, and it has been detected by computer in the factory for four times. Replaced four platinum contact spark plugs and cleaned the throttle once, but after driving for hundreds of kilometers, the fault remained. I don't know what to do next now, please advise! Thank you. Hello! I am 10 Hyundai Xinshengda Cheyou. This car was produced in February 20 10, and was purchased in February 2020 1 10. At present, the mileage has just passed100000 km. The engine speed has been unstable in the last two months, and the power failure light has been on all the time, sometimes. Especially in recent days, the phenomenon of automatic flameout will occur when the idle speed is too low in the parking state. After many computer tests by the maintenance master, sometimes it shows that the system is too rich (1 exhaust) or the mixture is too thin or too rich when idling. After the computer is restored, the power failure light does not light up and temporarily returns to normal. This situation has appeared for more than two months, and it has been detected by computer in the factory for four times. Replaced four platinum contact spark plugs and cleaned the throttle once, but after driving for hundreds of kilometers, the fault remained. I don't know what to do next now, please advise! Thank you. It's the same model as yours. 654.38+0.5 million has been opened, and the cold car is slightly shaken. @ 20 1.9 hasn't been fixed yet.