When accelerating between 2000-3000 rpm I hear a rumbling type noise from under the hood. It seems like it is coming from the middle/right side of the engine? I can be in any gear and at 2-3rpm the sound is heard and goes away when I am done shifting/accelerating. Anyone know what this is?

TID

 

Any ideas?

 

You're going to have to try to be a little bit more specific