erratic A/F at idle and steady rpms

[billie2]

i recently put a SRt turbo kit on my 08 civic si and now my a/f ratio jumps from high to low repeatedly at idle and cruising speeds. everything else seems to be fine. sometimes it runs fine but most of the time it fluctuates back and forth how do i tune to correct this

[Spunkster]

Without the calibration and datalogs showing the problem as well as a complete description of what has been done to the car it is impossible to speculate.