I followed the plan outlined last night ... changed the intake gaskets, R&R’d both ignition transformers (remove, sandpaper both grounding surfaces, clean surfaces with electronics cleaner, and re-attach), checked #6 fuse in both fuseboxes (trunk and cockpit), and reconnected the alternator, then followed your instructions about scanning codes. I'm done for tonight and won't be able to work on the car again until tomorrow night, so there's no rush for you to answer. Here are the codes.
Initial code reading. Battery had been disconnected for apprx 24 hrs. I put the car back together and re-connected the battery, then turned the ignition to on position (didn’t start the car). Code P2104. I erased the code.
Second code reading. I started the car. It only ran 60-90 seconds before dying, wrench symbol and check-engine lights were lit constantly, there's no response to the accelerator pedal, and there's a cooling fan that runs constantly from the moment the ignition switch is turned to the "on" position. The cooling fan running constantly is new; the car won’t run long enough to get to operating temp but I assume the PCM is sensing that it’s over-heating.
I’m unfamiliar with my new scanner ($100 bucks from Wally World) but it read 12 “generic” codes and 1 Ford-specific code as follows: P2104 P0606 P0708 P0743 P0755 P0765 P1235(Ford) P2107 P2198 P0138 P0750 P2196.
After the generic codes, the scanner asked for car manufacturer and ran a “KOEO Ford/Mazda enhanced test” scan to come up with the following 20 Ford/Mazda codes. P0060 P0121 P0480 P0708 P0713 P0740 P0743 P0748 P0750 P0753 P0755 P0758 P0765 P0768 P0960 P1000 P1702 P2104 P2121 P2122
Hope this info helps. To me, it seems like the car is getting worse instead of better. Let me know what you think the next step is.