383 engine died...several times??

I am at a loss I took my 73 Cuda with a 383 out tonight it was running great untill I pulled up to a stop light and she died. It started right up and died again but started right up again. Then she ran great for 20 minutes stopped at a few lights and did not stall.
Turned onto my road and died again, this time it was harder to start..but the old girl got me home..like a true Mopar I might add LOL
I put her in the garage and started her again without any problems and jiggled every wire I could and she kept running.
What am I missing??? At a loss here, where is a good place to start.
I am thinking the alt...it was a night and I had the full headlight system on plus the stereo, but I thought the alt eitgher works or it doesn't.
Any ideas
Thanks
AL