Add the Crank Sensor ("Crankshaft Position Sender") to your list of items to check. Your stalling sounds like it *could* be related to engine temperature.

A simple way to check is to start the car in your driveway, let it idle, and find something else to do (nearby) for a while. If, after it gets hot, the car stalls while idling, the crank sensor could be at fault.

But the electrical tape on your ETA sounds more worrisome.

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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