Runs for a few seconds and dies Options

[aexe]

Hey all. Hoping for some advice on a intermittent issue I'm having lately. 1974 1.8L L-Jet with Pertronix Ignitor electronic ignition. Full disclosure, I AM overdue for a valve adjustment.

Six weeks ago I was a few blocks from home and the car completely died, like I had shut the key off. Coasted to the curb, spent 2 hours trying to get her to start without luck. Left overnight. Walked home. Walked back in the morning and she started right up and drove with no issues for weeks.

This morning after my coffee stop near work, she did the same thing. Started up and then died completely. Would not start again. Left there and walked to work. Went back in the afternoon and she started right up no problem. Drove to 20 minutes to my shop space with the intent to swap to a new ignition switch, as I thought this might be the issue, as well as changing out the AFM as I had ordered a new one due to some FI issues I've been chasing. Replaced both this afternoon. Tested and fired right up, solid idle. An hour later I drove home, about 10-12 minutes. As I was pulling into the garage, the idle dropped but I was able to catch it and pulled into a spot. I spent the next half hour starting and restarting the car, finally taking this video for a reference. The car starts and runs for a few seconds, the idle sways, almost recovers and then shuts off, regardless of throttle position it seems. I was also checking voltage from the alternator to the battery which above idle seems to be in the mid 13's. Also, it was raining on the way home if that matters.

I would love ANY thoughts on the car's behavior in this video. Stumped. Thanks in advance.

https://youtu.be/kkCBQGRhI5s