Curious if anyone has come across this before. I have a 2012 5.0 V8 e70. There is an annoying 'clacking' sound (like something is loose) from the engine bay that occurs when I release the accelerator at speeds from 10mph+. As soon as I lift off the accelerator, the clacking noise occurs until about 5mph and then goes away. It also goes away if I just tap on the accelerator, and then comes back as soon as I let off the accelerator. It doesn't sound when I'm in Park or Neutral and am sitting still. Any thoughts?