The EDS fault sounds like the EGR circuit, which can cut out the turbo I believe, or interrupt the ALDA pressure signal. I'll bet that is the majority of your low power issue. Maybe someone unplugged the vacuum line, or plugged it thinking they would get a cleaner intake system and more power? I think even adding a block off plate to the EGR will cause the "limp home" mode, you need to get more creative / complicated to eliminate the EGR on that engine.
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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC
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