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From what I know, it could just be the powerstroke cold start syndrom with the hydraulic injectors. Also, normal start times are up to 2.5 seconds in normal weather and I think I read that up to 5 seconds is considered normal for temps lower than 32F. I could be totally wrong on that, but google it or search this site.
Also, does it run great when it is warmed up? If so, you could try two things. Rev-x, which worked for me and cleared up about 85% on day one and has been getting better.
They also talk about Rotella 5T clearing that up after several hundred miles of driving. I am going to try that on next oil change.
lastly, you could install new injectors. Probably only one or two giving you the problem. Shop can turn injectors on and off and isolate the problem to specific injectors and replace them....expensive though.