Do you happen to remember what wire was causing the problem? I have been
having the same issue with my '89 Iroc-Z. I have replaced the alternator,
battery, ignition switch, ground cable, relays, and recently the ignition
control module. Still my car will not start after I have been driving for
sometime in the heat, after I let it cool down for about 30 min everything
comes back to life normal and fine.