INTERMITTENT IGNITION ISSUE

I had an intermittent electrical issue (maybe many) that I chased down for a while. Each time I thought I fixed it (with lots of help from the forum) it would come back a few weeks/months later (really destroys your confidence in driving the car, too). Mine showed up mainly as no start situations, where the starter would turn but the engine would never start. Chased all kinds of things in the circuit over time (ballast, distributer voltages, etc.).

The last issue (maybe the same one the whole time?) turned out to be the ignition switch connections weren't making good contact. At one point while the car was idling in my garage I put in the parking brake and the whole thing shut off (interior lights and all) so that kind of clued me in. A few years ago I replaced the ignition switch and some of the new switch wires were longer than the stock switch wires, which made the connector hard to place out of the way of the brake, and I think the interaction of that connection with the parking brake, coupled with the old connections, caused the intermittent connection issues I was having. It might be worth wiggling that connection while your car is running to see if you can rule it out. I eventually replaced those connections with metri-pack connections (that was fun) since they were available and it has started ever since (fingers crossed...) I don't think you can get the original connections outside of a new wiring harness.

I'd aggressively try 67Dart273's wiggle test throughout the whole circuit before throwing parts at it. I've thrown parts at mine, too, but it gets frustrating when it doesn't work. If it is an intermittent electrical contact issue, any movement of the wire can cause it to make or break (bumpy road, replacing parts, wire wiggling etc.).