Just another idea - you might want to crack open the EHA and turn the adjustment screw clockwise about 1/2 turn to see if things improve. This enriches the low-rpm mixture a minute amount and can help offset accumulated wear and/or vacuum leaks in an older engine.
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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280
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