possible vapor lock issue

OK so I've been having this issue where after my xj is warmed up and I've been driving around town when I shut it down and start it the motor will idle really rough and seem like its misfiring and if I rev it up it will eventually clear out. I thought it was because my valve seals were bad and it was burning oil (which it was) but that wasn't creating this issue because I've since redone my head and replaced all the seals and head gasket and the intake/exhaust gasket and its still happening. It happens more while I'm out wheeling and the other night it was starting to happen while just driving up a trail (it was only happening when we would stop on the trail and I would shut it off and then would be a rough start again before this last time out wheeling) so I opened my Schrader valve and cleared all the gas out of the rail and then prime my pump and it would start perfectly fine and run alright for about ten minutes and it would run rough again until I repeated the process. So I think the fuel in my rail is boiling or something. Any help would be awesome. Its gotten to the point where I turn down a whole day worth of wheeling because of the inconvenience of this issue.

It would be helpful to list your year.

Its a 1992 cherokee larado with the high output 4.0 and aw4 transmission. I heat wrapped my fuel rail and fuel lines earlier so I'm gonna see if that does anything for it.