On my stock 86 Shelby Charger T1 I recently started having the ignition cut out in odd ways. after start up and idle for a minute it will cut out, i have to turn the key off for a second or else there is no spark.

No codes shown

It stays running after its warmed up but eventually cuts out, seems random but happens less after engine it at op. temp. Sometimes it just backfires for a second but comes back and drives fine.
I've already inspected the wiring harness along with jiggling it while running to see if its a loose wire or a short, no luck.

Ecu going out?
Distributor pick up?
Is there something else that affects the ignition circuit?

Looking for tips from those much more experienced than I for places to start prodding.