2004.5 LLY 2500HD. 59K miles. I change my fuel filter a few weeks ago. Now I intermittantly get a buz, fast rattle sound from the filter/turbo area of the engine at idle. If the engine is revved, the sound goes away. It only occurs at idle and not constant. It comes and goes; sometimes at stop lights, sometimes when I start it, but never constant.

Any ideas would be thankful!