[GaryR]

Listen to Ingo, and if it isn't the DME relay (or the connection you mentioned) ship him your ECU for a rebuild as cracked traces and other 30+ YO components in there can cause nightmares and a ton of grief trying to figure out the issue if it's not a simple fuel supply problem... which I doubt from the way you say it dies like someone pulled a kill switch. Obviously check battery ground and the transmission to body ground too..