Hard start after running

The TPS would have been my first guess too, but scan for codes and see what comes up. That might save you replacing parts that aren't broken.

Thanks. Only code is O2 sensor, they are brand new, along with new exhaust, cats have been replaced as well.

Okay. Sometimes a fuel problem will not set a code. Check out fuel pressure or listen for the pump. The filter might be need replaced and on this truck I believe the fuel pressure regulator is built into the fuel filter. That may help if it's over 30K miles old.

First try replacing gas cap may not be venting properly causing rubber gas lines to collapse and far as replacing 02 sensors and check engine light still comes on if you use 87 octane gas try using the 93 or 94 octane gas had same problem and replaced sensors and check engine light still came on until started using higher octane gas took about ten tank fulls and light going off and coming on 4 time now light is off if you are in a hurry for light to go off you can try some catalytic converter cleaner like cataclean may or may not help but read some good and bad reviews but mostly positive.

Thanks, I've always ran premium fuel, cats are brand new. I'm not concerned about the check engine light, truck starts and runs great, after being driven, if I turn it off I have to wait about an hour before it will start again.