Ming Rui trembled and felt depressed when he refueled. Why?

Check whether the oxygen sensor is poisoned, and then check the air flow meter. Throttle body! There is nothing wrong with the electronic equipment. Check the fuel pressure in the main inspection oil circuit. Check the working condition of the fuel pump and clean the fuel nozzle. It may be caused by the lean mixture. If cylinder 4 is not in the cylinder, the high voltage line and spark plug must be replaced. These will do. By the way, see if the voltage regulator is broken!