fueling issue?

I was driving my dart around today, this morning it was nice and sunny, the car ran perfectly, air fuel ratio on the gauge was where it always is. Then I got caught in some rain and it got pretty cold, was running good for a bit but then the air fuel started jumping around and leaning out, then it started cuting in and out like it was running out of fuel, but it has a full tank. Barely runs, I had to get it towed home. I canstart it up, and seems to idle ok, just under More rpms Is when it dies.

I'm thinking its a fuel related issue. I have a mechanical pump (pretty new) and a fuel pressure gauge that was reading about 2 psi, so pretty low. Think something got clogged up in the tank? Or could the fuel pump be starting to fail?

Engine is a 360, Holley 650 on top, combo is pretty new (1000 miles) oil pressure is great and never changed, so engine is not the issue.