1993 Honda Del Sol....

I've read enough about main relay symptoms...

Symptoms: Car will crank, and maybe run for a second, then dies quickly, and won't restart on a hot sunny day or after running the heater full blast for a while, and will start fine after cooling for a couple minutes.

This exact same thing happened to me twice on a very hot day..but I don't know if they were caused by the main relay. This happened when I tried to start the car after its been sitting under the sun for hours.
But it never stalls when I am actually driving or waiting at the light. Even when I have all my windows up and run full blast of the heater for over hours, it never stalls, as long as the car is running.
Is this main relay issue or something else?

 

go to the top here and click on faqs and there is one about main relays...read it and you will find out