Where's the seeker vacuum tube?

The Explorer vacuum tube is located on the intake manifold behind the engine throttle. According to the relevant public information, the explorer's vacuum tube is usually pulled out on the engine of gasoline engine. At the intake manifold, the vacuum tube will affect the engine operation, especially the idle speed, because it will take away fresh air from the place where you pull out the tube, so that the ECU can not accurately calculate the intake air volume and control the idle speed. Under normal circumstances, the idle speed will rise and fluctuate greatly.