I'm pretty sure you've already swapped vacuum transducers from turbo to EGR and confirmed both are working?
Have you checked that there are no exhaust/air leaks at the turbo? Next on my list would be pulling the IM/EGR assembly and making certain everything is clean (and moving freely) all the way back to the air filter.
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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