My suggestion, as a novice tuner, would be to turn off your O2 feedback, get the car to idle, then move spark timing to get the best(lowest) map value. Then, do the same with fuel. Once both of those are done to achieve the lowest map value, look at the O2 reading. This reading is the value that the engine likes at idle. Set your a/f table to that value. After that is done put the ecu back into closed loop.
Again, we need the system and options.