Loses power over 15 mph

Sometimes a sparkplug will function perfect at idle but when at higher speed it starts to breakdown such as incorrect heat range/deposits/wide gaps

Get that looked at and the other areas I've mentioned.

Yes, that would definately make it run bad. Make sure the plug wire is on the distributor cap and the spark plug correctly. Take a look inside the wire at both ends and make sure the connector is not damaged. You should fell that little click when putting the wire on the distributor and spark plug. Buy a spark tester, they're cheap and plug it in the wire to check for spark at the plug. Also, check the spark plug for any hairlne cracks in the porcelain.

Welcome back:

I have to be honest, I don't feel it is a plug wire. Interestingly, in your video there was no backfire after it started running again. If it was a loss of spark, I feel you would have a backfire when the spark returned because the injectors would still be fueling the engine. With that, my next suspect is a camshaft position sensor. I asked your location because the CA emissions ones don't have the sensor. I attached a picture of it. If fuel pressure is good (however you need to confirm what is leaking on the regulator), it seems that something is shutting down injection. That is why leads me to the sensor. The cam sensor on this vehicle signals the ignition module for ignition timing. If I recall correctly, if there is no signal, the injector pulse is lost, too.

I attached two pics. One is location of the cam sensor and the second a portion of a wiring schematic. Locate the sensor and confirm proper connection, eliminate any corrosion, and make sure the pins in the connector are not damaged.

Again, in your video, the engine basically seemed to shut down and then pick back up again. That isn't a loose plug wire.
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You are starting to get a lot of feedback from people. If you have the chance, check the sensor and let me know what you find.

Take care,
Joe

Welcome back:

Sounds like a plan. Let me know what you find. Also, am I correct in saying the engine shuts down for a second or two before it starts picking back up?

Joe

When you check the fuel pressure I would also take it for a drive where you know it will cut out. See if it changes. Unplug the regulator and plug the vacuum line, start the engine, any fuel showing on the regulator vacuum connection?

Have you repaired the alt wire? Did that make any difference?

You know, I wonder if that was the problem the entire time. I'm not sure why it is draining the battery unless a diode is bad or there is a short. Do me a favor. Follow these directions for testing for a battery drain. Check with the alt attached and then disconnected to see if that is the source of the draw.

https://www.2carpros.com/articles/car-battery-dead-overnight

Crazier things have happened. Maybe low voltage was the problem the entire time.

Let me know.

Joe

Welcome back:

It could be either. If you have a popping, it is an indicator that ignition is starting to occur. If it loads up with fuel, I feel you would hear a backfire.

That's a harsh form of treatment. Sorry about that.

Good luck. When you get things straightened out we'll be here.