My van will not start after it has been cut off.

What is your question?

I can drive maybe up to 5 miles, cut the van off and it will not crank. It will turn over but will not start. After it sits a long time Then I can crank it back up. It has been running a little rough too. Sometimes when I crank it, it will idle up and down. Not sure but I may have more than one problem with it. Please, any help will be appreciated. I have had this van a long time and I plan on having it a lot longer. Thank you