troubleshooting 73 dart slant six...

Let's back up with the symptoms.

- Can you drive it around in 2nd gear all day with no issues?
- When you drive around cold is that in 3rd and does it run OK in 3rd when cold?
- When it dies, dos it act like it is running out of gas? Or does it suddenly cout out, or cut in anout completely several times and then quit?
- Have you blown out the main fuel line?

-it will still die in 2nd, I say 3rd, but I basically mean cruising speed.
-it takes a little longer to die out when it's cold, but it still dies.
-it feels like its running outta gas, it starts sputtering, and if I don't feather the gas it will shut off, when I do feather the gas it sounds like its pulling in a lot of air and dies, but if I pop it in neutral I can sometimes get it to idle again but most times it runs rough until I shut it off and let it cool down, then its fine until I drive it again.
-yes.

thanks for the help.