freakish_pimp

Hello im a newbie to this and need some help. I recently swapped a 08 5.3l into my rock crawler and am having a problem once it warms up it runs rough tries to quit and sounds totally different but if you shut it off let it sit a few mins and start it back up it will run fine till it gets hot again. Ive changed the spark plugs coil packs and maf sensor. Its not throwing any codes. Any help will be appreciated