It may be that you idle is just a tad low. I have the same issue with mine and if I just rest my foot on the pedal enough to raise the idle 100 rpm or so it smooths out. Eventually I will get around to adjusting the idle a bit but for now this method works ok.

__________________
Joe

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1980 300SD - 495k miles - 'The Ambassador'
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Former Family Members
95 C280
73 280SEL
90 300D
87 300SDL (X2)
86 560SEL
84 300D
80 300SD