I’m not sure what type of carbs you have, but if they are zenith, there’s a vacuum pod that is supposed to extend the stop point on the throttle to essentially give it a little gas if the vacuum pressure gets to low (= pressure too high/ too little vacuum). It could be that this is not functioning properly if you’ve got zenith carbs.


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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,