Newbie here..03 6.0 has the same symptoms..cold start, smokes, etc. Plan on giving it this test ASAP. I've had the truck 6 mos now, love it, but it does have 205K on it. Cold starts (anything over 8-10 hrs) or very cold nights..I have to let the truck warm up 5-10 before I can move it..not to mention it sounds and smokes like hell. Not burning oil, Injection pump was replaced before I bought it ( I know because I had to take it back because the stealership didn't put the J tube in correct..yup that shut me down) and I don't feel it is an injector..I could be wrong as I am not a mechanic..only know enough to get me in trouble...lol.