i have to take some pride in answering this question because i have has so much experience with mine. any ways, depending on what model and year. as far as i know they dont put them on vehicles...
A manifold leak is usually in reference to a failure of the intake manifold gasket. It can leak air, oil or coolant. It can leak to the outside of the engine or internally into the engine. A manifold...
It basically takes the air from the outside and sends it to the individual cylinders on the vehicle. It has a sensor in it that senses air flow and, with this information as well as other information...