Do a search for fuel pump relay- they get old and suffer from solder joint cracks. Mine would stall for no apparent reason, and after reading/searching threads I pulled the relay, took the relay cover off and reflowed some of the joints that looked cracked using a loupe to look close.
Worked great until about two weeks ago, and have had a few stall issues. Might be time for a new relay.

__________________
95 E300D gave away
77 300D, 227k, station car
83 300CD 370k, body gone away to the rust gods, engine is in a Yota pickup, going strong
89 190E 2.6- 335k, no more
79 VW FI Bus- 154k summer driver
59 VW Beetle ragtop- 175k
12 VW Jetta- 250k
74 MG Midget-78k