Technical Ford 223 Issues

Need a little help here. Started having an issue with the ole 223. It seems to start and run pretty well for a few miles, then starts to choke and stutter. The timing is right, the vent line from the tank is clear, and I put on a spacer to isolate the carb for heat. maybe there is something simple I'm missing.

 

Vacuum leak,plug wires good?

 

Plug wires are good, and I don't think there's a vac leak anywhere

 

Condenser? Sometimes when they go, they can act up once the engine gets some heat in it.