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I am in sunny SoCal. I inherited 3 teenagers thru foster care, and my '99 F-150 Lariat SC just wasn't making it. I picked up an '01 w7.3 TD X mid-November. It had 74,000, CAI, 4" TurboBack exhaust, Pro Comp Pillar gauges for boost, EGT, & trans. Also, DiabloSport Tuner. When I bought, was getting P0602 code (#2 Glow plug circuit). Check engine reset w/ programmer no problem. Now, I get same code for #4 also. I have 8 new plugs, and not a lot of time. I have it at dealership to replace while doing recall for CMP. Dealer called and said plugs in valve cover were undone; most likely they were bad; wanted 400 to replace (parts only since in there for GP).
Sounds like you need some help with that 7.3. Click on the Forums tab at the upper left and scroll over the boards to find what you need. I'll bet the 7.3 forum can help you out: https://www.ford-trucks.com/forums/forum31/ The Super Duty forum is also another good one to checkout.