My '86 245 was doing that same thing. Happened very seldom. After looking over the archives and the Bentley manual, I decided the problem was likely electrical. I made the list below and went through it:
-checked O2 sensor action (was ok)
-cleaned connections at AMM
-cleaned connector at distributor
-cleaned connectors at injectors
-cleaned connector at throttle position switch
-cleaned pump fuse up by the coil
-cleaned all ground connections in engine compartment (and several others throghout the car)
To clean I pushed the connectors in and out several times to wipe the surfaces (I didn't have spray cleaner but that would have helped) After cleaning, I put a little silicone grease on the connections (Sylglide) to reduce future corrosion.

I can't tell you which of the above steps fixed the stalling problem but it went away and hasn't done that for about a year now.