Throttle shooting

Hello. I think the problem you mentioned should still be the problem of the gasoline pump and the oxygen sensor. First of all, you said that the concentration of air mixture checked by computer is too high. This should be a problem with the front oxygen sensor. I don't know why the maintenance man said it wasn't the oxygen sensor. Generally, if there is something wrong with the sensor, there will be the sound of the vehicle idling unsteadily and the exhaust pipe patting. Second, the difficulty in starting may also be the cause of the gasoline pump. I suggest you find a professional repair shop to check. Please ask in time if you have any questions!