My 06 Ram Hemi was not running smooth like normal, so figured new spark plugs. Put new ones in and it still ran rough. Bought another set thinking there might be a bad one, and still the same. Thought at first exhaust leak but it sounds descent at idle, but really gets loud and runs rough around 65-70 mph. Also noticed the tube connected to air cleaner had a small amount of oil in the end when I pulled it off, which has never happened before. Not throwing any codes. EGR valve? Any help pointing me in right direction would be great. Does have 155k on it, so probably time for a timing chain. Thanks.