After BYD s7 started, the engine speed was unstable and turned off.

Hello, your fault should be that the throttle air intake control is not good, which leads to the engine computer unable to accurately control the air intake, which makes the idle speed control not good and easy to stall. You just need to clean the throttle. I'm happy to answer your question. I hope I can help you. Have a nice trip! If there is something wrong with your car, ask the car mechanic. 4S shop professional technician, 10 minutes to solve.