89 sidekick starting problem

[Granpa49]

This problem is intermittent but frequent. Most of the time it starts fine and runs strong. But occasionally you can crank it, drive it somewhere and shut it off and then it won't crank. The motor spins but will not hit. 30 minutes later you crank it and it runs strong for 3 seconds, then stops cold. You can crank it several times and it will do the same every time. The next morning it will crank like nothing was ever wrong. Any suggestions?