First start with the Mass Air Sensor that is plugged into the intake sleeve. Make sure it is clean. As well, check you wiring harness on that M104 engine! They casing falls apart and can inhibit the driveability SEVERELY!

Now, my honest opinion? I would check out the Oxygen Sensor! I had the same problem with my 1996 E320, and VOILA! She behaves again!

__________________
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-My Garage-
1996 E320: White 118,000 miles ~Dad's Driver~
1996 E320: Green 109,000 miles ~Mom's Driver~
~My Babies~
2000 SL500: Desert Sand 96,000 miles
-Previoulsy Judge Judy's-
2008 E350 4MATIC Sport
-Flint Grey/ Ash/ Black Birds Eye Maple-