Back in the day when experiencing a problem such as you describe, first thing we would do is make sure the engine was getting fuel. If all was ok there it was time to replace the condenser. They can at times intermitently cut out and the engine does just as you describe. It's not too uncommon to get a bad condenser from your local FLAPS.

Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
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USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)