The front hose of throttle valve is too soft.

The rubber of the pipe is too soft, the curtain is not firm, it is easy to deform, and the air intake will surge. When idling, you can touch the pipe with your hands, which is the most serious part of the engine compartment. Therefore, the original factory used virtual connection to connect the hippocampus with the car body, and deliberately tightened the screws so that the hippocampus could shake.