Ok, thanks to many here I have figured out many things that are not causing the problem. Thinking it could be a computer or relay but not sure which... Maybe the ECU?

Details are below if anyone has suggestions.

-Cold idle ~1000 P/N warmed up ~1500 P/N; no cruise control
-Codes: DM:5,6 Pin 8:8 Pin 14:2
-Upper harness is newer Delphi model, throttle swapped w/ 2001 non ecojunk
-Fuel pressure regulator, purge valve are good
-OVP is 2yr old, fuse is good
-DIY smoke test showed slight vac leak @ EGR...tested w/ mighty vac lost 3mm HG/15 min
-EGAS swapped w/ known good, no difference
-Stop lamp switch new

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1995 W124 M104 E320 Wagon. 175k Miles and Counting