FiTech EFI system

So after you've shielded the pick up wires etc, how has everyone's self learning gone? Any issues? I only put about five miles on mine and it ran good but didn't bang in like a 4bl....yet? It also pops on decal, seemed like fuel in the exhaust.
Mine is running great. Just a little engine stumble when I let off of the gas while cruising. I think this is because I have a manual valve body in the transmission and it goes to idle and confuses the Fitech I know there's a decel adjustment, I just have to play with it.