Well, good call that there was more to it than the ignition coil. Like you said, the engine ran very poorly, unbalanced with the missing cylinders, before it stalled.

The Mercedes dealership replaced the ignition coils and it ran again, smoothly, until it stalled again a few days later. Mercedes towed it back in.

This time they say it's the crankshaft position sensor.

So it's still a bit of a mystery to me.

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1995 E320 (2009 - current)
1985 300TD Turbo black (2007-current)
1983 300TD Turbo red (2008-2009)
1972 280SE (2004-2007)
1977 300CD (2003-2004)
1976 240D (1999-2003)