I cant offer you any help but i will watch this thread as i think i am having similar symptoms on rare occasions when i start from a red light i get a shudder and the car does not move as quickly as expected.Of course when it happens it just a reaction to let off on it quick then when i step on it again it seems normal!
This has been going on for a long while and does not happen often sometimes it goes a month or more without doing it and a couple of times did it twice in a day,only happens when well warmed up,never less than 15 miles from home. Did yours have similar systems previously? Don

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97 E300D 157000 miles
87 300TD ?141k? miles