I'm not sure if a thread was already created regarding this type of engine rattle ( i'm a wee bit buzzed).

It occurs only when I'm in drive and at a stand-still: i.e. at a red light. Its coming from somewhere in the engine bay for sure. I notice that when I raise/lower a window or turn the steering wheel, the RPMs move a bit and the rattling ceases for a second. This doesn't occur when I'm in neutral, reverse, or park...only drive while idling. I first noticed it after having traveled from my city to San Antonio (160 or so miles) and I came upon a red light.

My car is an 06 Auto Navi with 5k miles. I dont know if anyone has had any similar problems. Any idea as to what it could be?

 

Bring it to the dealer if you can reproduce it.