The problem of Buick Excelle flameout

Hello, there are many reasons why the car is idling, but the most common one is that the fuel injector and throttle need to be cleaned and the spark plug needs to be replaced. The other is the poor contact of the computer module mentioned by the 4S shop, but according to your description, I think it should be caused by the poor contact of the computer module. If the computer module is good, the idle flameout self-test light should be on immediately.