The situation described is basically a textbook perfect example of heat soak. If you tell someone with experience repairing vehicles that your car starts fine

The situation described is basically a textbook perfect example of heat soak. If you tell someone with experience repairing vehicles that your car starts fine when cold and find when you shut it off for a short while (e.g. buying gas they are going to nearly instantly hone in on "something is hot that shouldn't be".