Engine dies when I step on the gas

I was having this exact same problem this week. I started the Dart ('70 Swinger w/ 225/auto) Saturday morning for the first time in ~ 2 weeks and it started/ idled as usual for about 3-4 minutes, then I gave it some gas and it stumbled and died. It did that about 5-6 times over the next 5 minutes while I was trying to drive, then it stopped dying after that ( I drove it for another 15 minutes without a problem). I started it this morning after it sat for 3 days, I let it warm up about 5 minutes, and it stalled once about 50 feet from my driveway, then no more while I drove it 20 minutes to work.

For what its worth, it was ~ 40*F out both mornings here. Any ideas or advice? Im not sure its the fuel filter since it stops stalling after ~5-10 minutes. And it never did it before this week, but I've only had the car since September-put a whopping 60 miles on it since then!