Ive searched around but all I really see is everyone telling people to change o2 sensors. Well i just put one in and it started doing it. I have a 1992vxhatch so it had a 5 wire o2 sen. but we changed it to a normal 4 wire. I just got my car running again after my turbo project but i dont knwo what it is. Everythign i really bought was new so i dont knwo what it is and i dont want to lean out!! HELP!!

Set up:
JDM B16A (obd1)
Greddy 18g turbo from 99 si
440cc injectors
Uberdata chipped p72
skunk2 intake manifold.
GSR fuel pump (roughly 90k+/- miles)

Thanks.