I still haven't solved my power loss problem either, but I think I'm getting closer to the answer - Next thing to check is the manifold's EGR tube, I think I can hear air escaping and I know it isn't boosted intake.
Just today, at 60mph cruise on a slight uphill... 7-8 psi boost, and 1400 degrees on my EGT probe in the turbo's inlet? That is a little excessive on the heat, and a LOT weak on the boost for that much heat.
As for these vehicles overall... Ya gotta be ready for surprises. Just getting home last night and checking my mail (community mailboxes) I smelled diesel. Just as I'm wondering where it is coming from... Engine quits. Hoo boy, what now? Next thing I hear is splashing from the rear end, onto the ground as the ASD relay (where I tapped for my pump) hadn't shut off yet. Stupid fuel pump had ejected itself from the OUTLET fuel line (of course) and had been dutifully pumping my $2.89 / gal diesel all over the ground.
I think I lost a good 2 gallons or so between where the trail started (while I was still driving in, amazingly) and where it quit finally.
Pushed it forward a few feet, nipped the end off the hose and re-tightened the clamps. Now I'm just waiting to see what is next for this thing to demand my attention.
I said it before - A supermodel girlfriend would be less work to maintain and keep happy.