I dont know if this falls under your same problem. When I rewired my dart i had the same problem but I had an HEI system and no ballast on the car. I had to run a jumper on my ignition switch but i forget which terminals. Ive had no problems since then. The problem was when i released the key to the run position from start it cut power to the coil. I would try the white block dan suggested if that doesnt work ill snap a pic of my ignition switch.
