Did you mark all the vacum lines when disconnecting them? There are alot there to possibly mix up on those trucks. Double check all of your connections, check around the intake/carb for vacum leaks as well. You may also want to give a quick look to the choke, the one on my dads 'yota stuck closed and caused a similar issue. It woud idle fine cold, but the warmer it got the worse it ran until it just died.