72 Dart Struggles and Dies today, Why?

Choke setting needs re-adjustment, Its either too loose or too tight on the choke door, Or the "vacuum pull off" is not working, You just need a second set of "eyes" under the hood with air cleaner off when 1st. started cold too see how the choke door is acting, then have them either close it more or open it & see if it idles better & doesn't stall while its still cold.