engine hard to start when warm

my engine just started doing this recently, ill drive around a half hour then ill park the truck ill try and start it about 5 minutes later and it wont even try to start up. i think it has to do with my fuel pump but thats brand new, then i thought the cat. but it looked like someone cut it open once so i drilled a hole in it and no beads fell out, any ideas would help alot...

What exactly does it do? (or not do...)

ill drive for a long period of time about an hour and alf around 65 or be in heavy traffic and my truck just stalls out and you cant restart it for like an hour, it seems like theres a fuel issue or im just looking to deep.

Check fuel pressure (see youtube fuel pressure test), and vacuum leaks

Loping idle is vacuum leak. 30 year old lawnmower, or a new car on the lot. If it sucks air where it ain't supposed to, it lopes.

Brick on pedal, block TB arm, anything to get a STEADY idle. 1200rpms or so... Feed starting fluid spray, A LITTLE AT A TIME, EVERYWHERE. Rev increase is the leak.

In a tough spot to pinpoint? Light a book of matches, blow it out while the heads are burnin', and feed the smoke to the leak.

Both problem COULD cause hot re-start problems...