S-10 won't always start

I have a 94 s-10 TBI with 175K miles on it. Here's what happens. Most of the time it will start, but it seems when it is warm outside it strugggles to start or won't. Once it starts it runs fine, I can drive it wherever I want to go. When it is not starting, if I let it sit for an hour or so, I can come out and it will start right up. It seems to be random. For example, last night I left the house, drove to dinner with no problem. Left the restaurant and went to a nearby store, again no problem. Went to go home and it would not run. I got a ride home, came back in an hour, started it up and drove it home. Got it in the driveway, turned it off, and started it right back up. I can hear the fuel pump turn on when the key is on, and I don't smell gas like it might be flooded. I really don't know where to strart, being that it does run. There has only been 1 time when it was less than 50 outside that it has not started.

Any ideas?

Thank you