Dart dies when hot???

Engine -360/Holley Street Dominator vac sec/MSD 6Al/Accell coil/MP distributor
727
I had a problem with car idling high after it warmed up, shop took care of this, hooked up the electric choke.
Picked it up today, started up no problem drove it about 5 miles. Got on the gas a little and it went flat and stalled. Got it started again but it wouldn’t run when you stepped on the gas. Tried a few times each time it would start right up idle fine but die when you tried to drive. Stuck on he side of the road for an hour it cooled down then started and drove fine back to the shop. Shop thinks it’s a coil problem. It’s weird it starts and idles fine but when hot dies in gear?! Thoughts??

Fuel filter/s