1989 Mazda B-2200 will not always start.

I have a 1989 Mazda B-2200 5 speed Pick up truck. My truck has an intermittent no start problem. I can start my truck the first time I start it for the day. Sometimes after I have been driving it down the road it will cut off and will not start when I pop the clutch or if I pull over and try to crank the truck. It will just turn over and but will not crank up for some time. Or I can park it at the store and go inside and come back out and try to crank it and it will just keep turning over but it will not crank up for 5 to 10 minutes. So far it has always started back up. This happens only sometimes.
Thank You, Mark