UPDATE PART 1!!

Okay i was told that it might be the TB gasket in backwards. But i installed my urd kit months ago and have not had this problem untill now. But i checked it anyways and all is in order on that one. So i let it just run at idle in N in the driveway and for most of the time it did run at about 1000RPMS which seems to be a good spot. But every so often it would dip down below that and you could hear the truck give it more fuel to try to bring it back up or it could be that what ever makes it go down only lasts a few seconds. Now doesn't my FTC control all of my fuel and not the truck? I am lost on this one and need help! red