Where is the vacuum tube directly under the throttle of 04 Lingshuai?

A vacuum tube that controls the intake of the engine. According to the inquiry of Mitsubishi official website, the throttle vacuum tube is a component of the automobile engine, and its main function is to control the air intake of the engine, thus controlling the emission and performance of the engine. Its working principle is to connect the vacuum tube in the automobile engine with a system consisting of a valve and a throttle valve. When the valve is opened, the vacuum in the vacuum tube will be pumped out, thus controlling the air intake of the engine.