Dying Dart after being warmed up.

Mines doing the same thing! Mine had a bad hesitation when pulling out, and after adjusting the valves today, mine seem to get worse. But when I looked down the throat of the carb at idle, it is spitting fuel. Like "sputtering noise". Holley 1920!
Hopefully my valves are right, because it wasn't as bad before. But my carb sat for 15 years with the same fuel in it. ugh!!