Engine dies when I step on the gas

Hey all, I wanted to update this thread since I've been driving the Dart all summer and fall and still having the same problem. Fresh 93-octane refilled 3-4 times, new fuel filter, oil change, etc. Choke operates like it should. The car drives fine once its fully warmed up to operating temperature (good thing the temp gauge still works...) but if its cold it keeps stalling in EXACTLY the same way...

If the engine isn't warmed up, the car will idle fine in "Park". It has never stalled in Park. It will idle fine down the street in "Drive" if I go slowly, but it will stall like clockwork the instant I push the gas pedal enough to require the transmission to downshift.

Case in point: The Dart will go down my driveway and into my short street. The first turn I have is a left which goes up a long hill. When I push hard on the accelerator to go up the hill, the engine cuts out the instant when the car should downshift into first. (does that make sense?). It will start up again fine and idle fine, when I rev the engine it revs fine, but put it in "Drive" again and try to accelerate up that hill, it cuts out again the instant the transmission feels like its about to downshift. Once the engine is warmed up to operating temps, it feels like it stumbles a tiny bit the first time I press the gas hard (but doesnt stall), but then it goes fine like nothing ever happened.

This happens every time I don't let the car warm up fully first. With these additional facts does any of you fine folks have any insights? I'm not sure if its a carb issue, or a linkage issue, or a transmission issue? She drives like a champ once shes warm but its annoying having to idle 5-10 minutes waiting to leave. Thanks in advance

I do love the damn car :D