Tried a different egr valve hooked to the harness with my blocker in place to see if the position sensor was bad and it does the same thing. Only after a few miles of driving code P0401 pops up and the commanded egr duty cycle goes to 0% and under WOT boost is limited to 20psi.
I know my truck originally didn't have this problem. I ran with it blocked for a long time without issue until I got reflashed when at the dealer for the trans update and apparently that flash was the one where the ecm started going into the supposed "EPA" mode when P0401 is set. I figured rolling back the strategy should've eliminated this issue but it hasn't. Bill set it back to a VXBC4 from the VXBC9 that I had which we figured should've been the original but maybe it should be earlier still.
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2004 F-350 XLT 6.0 Diesel 4X4 04/04 Build
PHP FICM & Rolled Back ECM/TCM 
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