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Ford F-250 Super Duty Questions

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Motor is real sluggish and have to stop and restart the motor. The its fine for a while until it does it again. Seems like it only does when it's rainy weather
Replaced intake gaskets, no change. switched COP's and no change.
Truck does not drive or shift differently. Will it harm the truck to keep driving it?
all light\s -air -etc work just no dash lights & when I stop At Stop sign it pulls away in 2nd gear!!!
In two weeks time, my truck has gotten worse. First was glow plug light staying on and no fuel flow when trying to start. Then last week started shutting off after first get going. Problem is getting worse. If I get all lights on dash (water in fuel light comes on and cycles off), glow plug light goes out and truck starts. If water in fuel light doesn't cycle on, glow plug light stays on, and truck will not push fuel to start. Cycle key over, doesn't always work, sometimes works. 2 nights ago, check engine light finally came on, drew 7 codes, which I don't have here as I type this. New GPR installed today though, so it isn't that now.
2 new batt ,new fuel filters new oil filters checked and confirmed fuel at top engine mount checked ficm 48 volt ,had starter benched tested good and replaced altinator also checked all pulleys cranks really slughish and sound like something holding it from turning over
When I drive down the road I will hear a grind sound like 4 wheel wants to kick in , if I turn on the 4 wheel drive it will stop. I have to drive it in 4 wheel drive or it will do this all the time it is set on auto on the hubs, they have been just replaced, I no the pump is good or the 4 wheel would not kick in. What would cause this to do this a short in the switch on the dash or is their any other part iI should check.
All other states "ready". I have performed 5 drive cycles as per recommended in the owners manual, another from the ford site, and another found on you tube as well as "just drive it some more" as the smog shop recommends. NO trouble codes have listed.
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