Sounds more like a sticking turbo to me, but as Matthewd11 posted, more information is needed.
First, what are you reading codes with? Not all code readers read 6.0L codes well.
I would also resolve the WIF light and glow plug lights first. They may be indications of electrical issues that could also be causing other issues. Or, you could also have corrosion and/or plugging in the HFCM.
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