Why does my 1995 Z-28 runs perfect for 15 minutes then starts misfiring bad then dies will not start for a couple hours then the same thing happens?

Why does my 1995 Z-28 runs perfect for 15 minutes then starts misfiring bad then dies will not start for a couple hours then the same thing happens?
The coil probably needs to be replaced. This can be a symptom of a coil on its way out.