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The IPR (injection pressure regulator) is a valve that bleeds off HPOP pressure as ordered by the PCM to maintain the desired pressure for the injectors. The coil is the part of the IPR that moves the plunger in and out. Just like any electromagnetic coil, they can weaken over time. When this happens, they don't do so well when they are heated. Since you can't buy the parts individually, just replace the whole IPR valve.
2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM
I wonder if clouds ever look down on us and say, "Hey, look - that one is shaped like an idiot!"