Water temperature and stalling out

[Ron61]

I agree with the heat causing the problem, but even if the distributor is bad, that shouldn't keep the motor from turning over. I would get a remote starter and run it where there is no traffic until it stops and then start using a VOM to check for voltage at the starter and other key points. The loose ground is sounding more and more like a possibility and seems to be one of the key causes of these cars having weird problems. It is possible the starter is shorting when hot, but I doubt that.

Ron