It looks like Beloved Blue was dropping two cylinders because of corrosion on the contacts of the ignition control module which drives the coils. It's been a recurring problem.
The control module gets quite hot. The paste between it and it's heat sink had long since disappeared.
De-Oxit and De-Oxit Shield on the contacts and some heat sink thermal paste and it's burning oil once again on all four cylinders.
All is right in the world.