May I suggest you try a new crank position sensor.

My reasoning behind this- 2 weeks ago I had a 2002 ML320, 112 engine, If you drove it like grandma, it was ok, if you punched the accelerator, cyl 6 misfired and it shut down the cylinder. It had been to another shop twice for this problem, they had replaced spark plugs, coil, wires and injector for that cyl, and even replaced coil, plugs and wires for cyl 1 as well. When I got it a month later, I tried driving it with the exhaust off, a new air mass, inspected all the plugs again, ohmed out the wires, checked coil signals on oscilloscope, tested spray pattern of new injector, reset mixture and ring gear adaptation, checked timing of engine, removed valve covers and checked for weak or broken valve springs- finally thought what the hell, I'll stick a crank sensor in it. That did the trick, of course it was going to be the last thing I tried.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350