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Well, I will also say Welcome but, try and give you some advice also for your starting problem. First of all, you've got the right idea with checking the GPR. But my guess, if it is really cold, and starts at all, the GPR is good.
My guess is glow plugs. Probably one or two bad ones.
If it is a late 99, take the plug off at the valve cover and check the resistance on the two outside pins. It should be right around 2 ohms. anything more and it is no good.
Second, is the oil up to level. If it is low on oil, it could create a hard starting problem. Really cold temperatures with not plugging it in might need lighter oil, say, 10W-30 or synthetic. I'm talking temps of 20F and below.
Also, check the fuel filter, and drain any water from the filter housing. There is a lever on the back side of it that will drain it to a hose on the passenger side above the A-frame. Make sure you are using a good grade of fuel and in the really cold temps use a fuel additive to prevent gelling.
Start with these easy checks.
2000 F350 Crewcab 4x4 7.3l with AFE stage II, MBRP 4" turbo back, Turbonetics "Quick spool" turbo with .84 housing, DP Tuner chip, 80 tow,80 econo, 120 race.