So I guess I'll add on to this thread. After some responses, I suspect it might be a battery problem.
But here's the situation, I was driving yesterday for a good 15-20 minutes or so. In the middle of sitting at a stoplight, the whole thing just shut off and died. I went into park (after pushing it off the side of the road), tried turning the ignition, and there was no response.
At first I thought it was a broken alternator not keeping the charge in the battery causing the whole thing to die while driving but now I'm thinking it could be the battery. However, I did recharge the battery back to 100% (according to the meter on the charger) prior to driving.
I examined the wires connected to the alternator and they looked pretty dirty. Also I had a friend with me during the break down and I had him jiggle one of the wires while I turned the ignition and it started fine. But then I shifted to drive and the whole thing died again. Jiggling the wire didn't work again. The accessories didn't work either.
1967 Chevrolet Impala 4 door "post" sedan
327 5.4L V8 - 3-speed TH350