Our '90 300TE 4matic with 93000 mi has died twice recently while driving on the highway at speed. Both times we pulled over and the car started up and off we drove. There is no sputtering it just quits suddenly. What are the most likely causes of this?

round up the usual suspects and check.sparkplugs,wires.cap and rotor

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michael cole 1980 300SD gone now but not forgotten,87tdt,90 300te 4matic 95 e320 wagon

My experience with this issue on this vintage W124: fuel pump relay.

If it continues to worsen you can remove the relay and jumper the pins (don't have schematic in front of me right now) to confirm

HTH

Brian

Fuel pump relay is a prime suspect, but there are more. Any check engine lite, was the wiring harness replaced and check for stored codes?
Ed

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Ed
1960 220 SE Coupe (Ponton)
1999 E320 Wagon
2007 E350