Car starts but after its driven awhile it won't start. Can clutch start.

You stated you can "clutch start it" .. Does that work every time? .. That's usually more of a no crank issue, as in starter isn't working.

Why would it start the first time and then when hot not? Where can I go to get a diagnostic test done and do you know how much they are?

https://repairpal.com/repair-shops

Thank you