My 2000 7.3 skips in the morning when the outside temp is below about 60. If it happens to be closer to freezing it won't start at all. As soon as you hit the road and mash the accelerator beyond the half way point the skip imediately goes away. It was put on "the computer" and an injector test shows no problem. If you plug in the block heater all is fine. Doesn't really seem to be a glow plug problem. But, then again, I am still trying to figure out why a direct injected motor needs glow plugs in the first place!! My buddy is having the exact same problem with his truck. Anyone experienced this?