I reread your first post again and was wondering what your most recent problem was.
Is the car shutting off and comming to a stop?
Does it start right back up?
Or is it more of a rough running problem.
Maybe replacing the parts you changed fixed some things and this is a new problem.So what is the most recent problem you are having? I ask because this site may help your mechanic fix the problem as he may not be very familiar with Mercedes fuel injection.
Thanks
Rich

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88 300E White, sold 9-04
88 190E Black 2.3 sold
90 300CE White, Grey sold 12-24-04
92 400E White,Grey Sold 5-06
90 300CE 91K Signal Red,Black Sold 2007
1989 300CE Smoke silver,Tan Sold 1-08
1993 300E 3.2 M104 motor
1991 300CE White,Grey
1994 E420 beautiful car,gone to new home
1994 E320 Smoke an Parchment.Beautiful car