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I had a similar issue on my 300SEL. Eventually found out I had two issues.
1. Bosch distributor cap was cracked.
2. Ignition Control Module. When the car and ICM gets hot, it would cut out. Same symptoms as you describe. Try an ice-pack on the iCM when the car cuts out, and if it starts and idles fine, that is your issue. Instead of a new one, I got a used one off eBay. Still running fine after a year!
Good luck! It took me and my mechanic about four months to sort it out..
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2012 Mercedes E350
1988 Mercedes 300SEL
1996 Nissan Pickup
2003 BMW K1200GT
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