new guy ignition problem?

[tchevy]

Hey folks, new guy here.some folks at a pop up camper forum turned me on to this site. They said you all are geniuses. I have a 1992 chevy silverado 4x4,350,automatic.My problemis that after it reaches normal operating temp and is turned off sometimes it will not start for maybe 20 to 30 min.When I say it wont start I mean it wont do anything not even cranck until it cools down.It runs perfect while it is running and starts up first time when it is cold. Battery is new(last fall),the terminal cables are clean and tight,the connections on the starter seem to be tight. The starter was replaced last year when I had this same problem.Anybody have any ideas? Is it an ignition problem or a cranking problem?

Thanks in advance.

tchevy