I had a similar experience with my 380SE, only that symptoms started as intermittent stalls, then very often, and entually won't start, very lucky I still got home. Found to be faulty ignition module.
I was told that the ignition module often fails on these models, so , after this bad experience I now have two modules installed, one as the backup...feels much safer and reliable.
The wires on the coils goes to the ignition module, diagnostic socket, and fuel pump relay in fuse box. I think the green wire goes to the dignostic socket.
I think the green lead Benzmac was referring to is the (think) one that goes from the distributor to the ignitin control module. This is the "control" wire, it provides signal for module to control coil. If this is faulty then no/bad signal and thus no spark.