I'd say try cleaning your injectors. I had a car with even worse than yours in symptoms. Following another forum member's suggestion I put TWO bottles of Techron into a less than full fuel tank and within minutes the car ran much better. Warm it up and go for a drive. Preferrably running a little harder than usual.

Just remember to change your oil shortly after you have run through the tank of fuel+Techron.

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)