FiTech EFI system

got my fitech up and running it does have what seems as a lean condition when I get off the throttle for a few seconds and the get back on it. this is with just a few miles on it. should I play with the decal fuel cut off or will it learn through this?
Not sure what causes that but mine does the same thing. I was going to adjust the decel FCU as well. I will let you know it that fixes it. Make sure you save your current tune before you change anything.