I have the same problem on mine...and it seems to keep the cruise control from working properly too.
In a query here last fall, or possibly in a conversation with a Mercedes mechanic, I was told it was likely the throttle control needing adjustment.
I'll watch this space eagerly...it would be too wonderful to have the problem be fixed by "an adjustment" rather than a $400.00 part and an hour of labor.
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Tom
'87 560 SL
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