I'm installing a 6AL for a friend on his Roadrunner.

We're using the Mopar electronic distributor to trigger it.

I couldn't get it to fire initially so I did the green to purple jumper with the key on. It worked fine right off the box. I then tried to jump the leads on the pigtail right next to the distributor. Very intermittent. It simply would not spark but about 1/3 of the time. I replaced that segment the of wiring and it seemed to trigger better. Pulled the distributor out and it seems to trigger if you spin the shaft at higher RPM but not slowly. I did check a couple of pickups to make sure that wasn't the problem and checked the gap.

Is the box the issue?!

Positive side feeding the box is directly off the battery and the negative side is too.