I have a V6 1LT and while the car is at idle I hear a constant clicking sound. Some threads on here state it is the fuel pump or something like that. I'm wanting to know if any of you hear a dropping sound right after you shut your engine off. It almost sounds like marble being dropped on the engine block. Very strange. It seems to drop and kind of bounce, then you don't hear it again until I crank her back up and shut it off once again.