[4x4k30]

I had some problems with my 6.0 swap similar to yours. my problem was with the maf sensor so that's what I would check that first you can tap on it with it running and if it stumbles you will know its the maf sensor if that make no difference try unplugging it with it running and see if its idles smooth with it unplugged . after that if no luck check to see if you have any vacuum leaks I have seen a few intakes that will get cracked from being removed and installed .also are you sure the engine has the dod ?I was thinking that didn't come out until the 07 modles up