Every MBZ I have owned up to the mid 90s has stated in the manual that in some cases you must slightly depress the gas pedal when starting warm. Does that help, or does it still hesitate to start hot even when doing this?

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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