There is some sort of electrical component that must be stressed when hot and prevent the ignition system from firing. After the engine cools it fires up on first try. Its not vapor lock. what ignition parts seated on the motor would you replace first then next etc? convinced that when motor shuts off their is no cool water flowing and for a brief period the engine components get even hotter causing this part to fail until it cools. Any thoughts? what would you try replacing first....and following that etc? what priority /best guess? Thank you so much for your help....I could deal with this if this happened to me...but if it were to happen to my wife or children....this would not be good...I have to fix this issue.