Compression Ignition Addict
Join Date: Jun 2011
Location: Colorado Springs
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Are you loosing any coolant? Have you scanned for codes? Do you monitor the EOT/ECT delta?
I would think the first thing to check is the FICM. Do a search and you will find the procedure (check it cold at three points: KOEO, cranking, and running). Also be sure you batteries are healthy - get them load tested (individually, not as a pair). Weak batteries can hurt the FICM. A weak FICM can kill injectors. Gets expensive fast.
Also you should change your fuel filters ASAP. They should be changed every year or 10K miles or so. Should also be draining water from the HFCM regularly.
2005 F-250 6.0L, crew cab, long bed 4x4
completed in 2011: STC update, new IPR, BPD EGR cooler, oil cooler rebuild, 6.4 banjo bolts, blue spring update, SCT X3, Insight CTS, 58V FICM, CCV Mod, DIY coolant filter (now gone), refinished turbo
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2012: ARP headstuds, OEM gaskets, standpipes and dummy plugs
2015: XDP coolant filter