[Yetiman]

I had an intermittant ignition failure after I put in an MSD 6AL. Replaced the unit, and a week or two later, same problem.

Turned out to be an intermittant connection from my alternator (single wire regulator) to the battery.
I put an 8 guage wire in between the alternator and the battery disconnect, and never another problem.

Whether it was lower voltage (it never really got below 12 volts, and they claim it will run on 5 volts) or more likely the intermittant output from the alternator I don't know, but the new wire solved the issue.

Just a thought.

Doesn't hurt to check all the grounds for the ignition either