I checked the fuel pressure again with the EHA unplugged and it was around a .3 bar difference. I pulled the eha and turned it half a turn and put it back on. I haven't put many miles on it since but it feels much better than it did. A lot more responsive thats for sure. Time will tell if that "fixed" my problem or if its just covering up another issue? The idle seems to surge a little bit but its just barely noticeable at times.

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99' ML320
03' C32 AMG
89' 190e