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Hey everyone just a quick question. When I pop my hood with the engine running I hear a fairly loud hissing noise that almost sounds like an intake. I traced the sound to a small tube like thing about the width of a pen right next to the spark plugs. It is facing upward and sucking in air, when i put my finger over it and cut off the sucking then engine stalls out. As soon as i remove my finger the engine goes back to normal. Is this a normal piece of the engine? It just seems weird and out of place, almost like it should be connected to something. Any help would be apprecieated...