I once had an 83 380sel that would stall while running - no other symptoms. It would restart easily and I couldn't figure it out. I checked fuel, battery ground and probably some other things I can't remember. It finally died on the interstate and wouldn't restart. Turned out that the coil died.

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07 E350 4Matic wagon, 06 S430 4Matic, 99 SLK 230
retired W210 (x3), W124, W126