The O2 sensor reports to the ECU the gases on the way out and makes adjustments on that. If the car is carring on like a pork chop, I'd start by testing the coils/DFI unit, replace the O2 sensor & check the TPS.
Also your leads can brake down under load - like it will drive fine on the flat - but hit a small hill and the car starts to miss when you put your foot down. Change leads.
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