The first gear idles and the car jumps forward. What happened?

Having experienced the same problem, I am glad to share the same method. The car is idling, and the frustration is particularly strong. I felt that the oil supply was intermittent, and then I drove to the familiar 4S shop. After communication, the maintenance idea is determined: check the oil circuit first, then check the circuit. Because the car has not been used for a long time and the probability of circuit failure is small, it turns out that small probability is also possible. First, clean the gasoline in the fuel tank and replace it with Sinopec gasoline. After driving the test drive route for two laps, the problem remains the same. Clean the throttle valve, nozzle and the whole oil circuit in turn, and the problem remains. Only check the circuit, this time it is very simple, replace the spark plug, solve the problem, and restore the car. To sum up, find a reliable maintenance shop, and then find a reliable maintenance master, communicate with the master more and take fewer detours, because a good master will have experience and maintenance ideas.

For reference only, I wish you an early repair.