I am datalogging my turbo GSr hybrid. Setup is completly stock 97 gsr motor converted to obd1. I have a Revhard stage 2c kit hondata stage 2bd running on a usdm p72 w/ base map running closed loop,550cc injectors, stock fuel pressure, and resistor pack.

My car idles at around 900 rpm when warmed up. Now when i datalog i am watching my long term and short term o2.When the car is running smoothly the short term o2 is at +40%. Suddenly the rpm drops to 650 and the short term o2 reading drops to 0. When i am looking at the o2 voltage it is not fluctuating, it is almost frozen at .10-.16
Meanwhile the long term o2 shows nothing bnut +40% the whole time.

When the car idles nicely the 02 voltage is fluctuating rapidly and short term o2 is climbs back from 0 to +40. Does anyone have any clue why this is happening. the car will go through this same cycle over and over every 3 min or so. I have tried a new o2 sensor and still have the same problem.
I also drove the car about 5miles and came home and then the car starting running normal again idling nicely at 900 rpm and again short term o2 at +40%.

Could it be the base map that i am running on my car?? Any suggestions please.