On my 2005 wrangler 4.0 sport there is a whirring noise coming from the intake somewhere around the manifold. It sounds like someone is blowing on the top of a glass bottle. Only occurs at idle, goes away when you give it gas. It it loud enough to hear from inside the cabin. I took off the intake to find some exhaust remnants past the butterfly valve (if thats even the correct terminology).
Pic of the throttle body:
imgur: the simple image sharer
Video of whirring noise:
Hopefully this should be an easy fix, I dont want to go back to the shop...lol