I was working on a 2000 f350 7.3 it had trouble starting so I replaced 2 glow plugs and the relay. Let it set over night it was fairly cold outside started great. Pulled it back into the shop to clean off the engine cause I also replaced the water separator drain and I was cleaning ip the fuel in the valley. Tryed starting it after that wouldn't start found that the ipr connector was shorting together replaced that cranked on it for ever finally started. So I went And drove it to get the air out of the system. Pulled it back into the shop. Still started hard. Watched icp it slowly came up and fired at about 1000psi. Spec to fire the injectors is 500. Finally got it to start ok. Over the past few days starting got worse and today it just wouldn't start. Any ideas to help out I'm at a loss.