If it has been warm out, and/or the stalling occurs only when the engine is hot, the Crankshaft Position Sender Unit could be frayed. That got me last year.

Easy, quick, approx. $90-100 repair by a tech.

If memory serves, it is a cable/sensor that runs from the back of the engine to the ignition control unit(?)

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black