gsr in a civic hatch...........I'm getting a flucation on idle and noticed that with the air intake off, I heard a loud sucking coming from one of the two holes in the throttle body, I plugged the hold with my finger and the idle dropped right down to 750, so I figure that is the problem, I'm wondering where that port leads to because I figure there's a shut off valve somewhere that is not shut when the car is idling. anyone know ??