What would cause my 1998 buick park avenue to start then shuts off after 15 minutes and wont start again?

I'm not sure why, but I had a 1995 Buick that did the same thing.

I spent all kind of money with several differant mechanics, that never did

fix the problem. I finally traded the car on the day that it was running.

The car seemed as though it was haunted! Sorry I couldn't help.

TRADE THE CAR when it's running.