Originally Posted by KewlGyrl

Running rough could be causes by bad EGR valve or something like that. Diesel engine sound is due to Cam phasers I think though I could almost swear the mechanic said Cam pulleys? Not sure if there even is such a thing & haven't had time to research it yet. I had the same problems as you. Replaced the coil packs & spark plugs which helped a lot. EGR valve replacement should take care of the rest I hope. Good luck with getting yours straightened out.