Sounds like chains dragging?
 

Sorry if this has already been a topic. I tried searching through a few pages but didn't see anything similar to what I'm experiencing. I'm new to this forum and I drive a 2007 Mitsubishi Outlander.

While driving, it sounds like a chain is dragging. I've noticed that it stops when I hit the breaks but as soon as I start accelerating again the sound comes back. Any idea on what might be causing this?