68 Valiant dies and runs lumpy, then suddenly runs fine.

sounds like the alt. gauge problem and stalling could be related to a dead short to ground under the dash . I had the same thing happen on mine . Mine was the power wire for the dash lights that rubbed through and a p/o had used a piece of aluminum foil and wrapped it around the fuse because it kept blowing the fuse . my alt gauge would show a strong discharge and the car would not idle and the more gas you gave it the more of a charge it would show but was intermittent some times fine for days then all the sudden bam it dies at an idle. after i found it and fixed the prob it ran great