It's baaaack! HELP

Adding to whats said above, run a voltmeter with an extension wire to the power + input of your ignition system, I assume there is a single 12 volt + input on it, or maybe it has a main hot to the battery and a "signal" which activates it coming off an ignition switched source. Then while driving, monitor your voltage to the ignition system + input(s), one at a time. If power is disappearing to your ignition system you will know. Then trace the source of power intermittency. If it wont start, and you show low or no voltage on the power input of your ignition, then you know its your + power source wire from your car thats the issue. Heck if not a power source issue, it could be a grounding problem. Where is your ignition system mounted? Does the ig system and auxiliary components ground thru their mounting frame(s)? Also, if you (or a short) ground the tach wire it kills the ignition on some systems. So if your tach wire or tach is shorting out, could be your problem... Remove the tach wire from off your electronic ignition system (at the ECU, brain or similar) and test drive it.... My suggestions before you have some one else go spending your hard earned money digging around in your wires for a month.