RUNNING RICH

[GIFF5323]

02 Civic HB SI
K20A3
JRSC-R

I am getting a CEL that reads my car is running rich. Does the K-Pro on a new install historically cause the car to run rich until it is properly tuned?Also, will a tune take car of a brief hesitation or burp in the throttle if I am cruising on the highway or any gear for that fact around 3500 rpms? I feels like the car losses speed for a brief instant then back to normal.