Would not start when engine is hot. It has to cool down.

What is your question?

My truck turns on fine but once I run it around town and I turn it off. Well when i try and start it up it would not start it is hesitant. It will not start up again until hours later. They say it might be the knock sensors but then I heard if that was the case it would have no problem starting. I am clueless and I'm afraid because I'm a woman that they will take advantage, so I really need some advice.