Compression Ignition Addict
Join Date: Jun 2011
Location: Colorado Springs
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Mine was behaving similarly... one minute it would bog down and wouldn't even budge, then after you got it rolling along, everything would seem normal. Tons of black smoke when trying to take off from a stop. Did not sound like I had a boost or exhaust leak.
I came to the conclusion it was either the turbo being coked up, or else the EGR valve sticking open. The simplest is to clean the EGR valve. When you decide to do it, park the truck nose down overhight so that you can look for signs of a blown EGR cooler. Since you have already had the turbo worked on, I would suspect that is not your problem, but you never know. Try cleaning the EGR valve first, then you may be looking at cleaning the turbo. Other places to look are the various sensors (MAP, EBP, etc) and boots as Ham Radio said.
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