leftyskikass555

Has anyone everr heard of a humming sound coming from the throttle body on an MDX??? it gets louder when you unbolt the top of the air box. But the humming noise goes away when there is throttle input. I've already replaced the IAC valve. The hum sound would go away when the hole was plugged in front of the throttle plate. But the new one does that same thing. I've also taken off the throttle body, intake manifold, cleaned/de carbed everything. Still humming after that.

Any help would be greatly appreciated!!