I had a similar problem with my 69 cuda slant six car. As it turned out the tank sock had gone bad and trash was filling up my filter shutting it down. I replaced both of them and drove on...... Make sure that there are no restrictions in the fuel lines and that the pump is good...
Hey! How you doing? My name is Joe Gilmore. I live in Ozark Alabama. I have loved All Mopars of all shapes and sizes, I have a few my self. So this is me, saying HI!! Thanks Joe..