I'm looking for a fuel controller for my 700 EFI hisun. It uses a delphi MT05

any help would be great. I have an AFR gauge hooked to my O2 sensor and when the sensor is plugged in i see roughly a 14.5 air fuel ratio and the machine feels sluggish. When I unplug the O2 sensor I'll see roughly a 10.5 - 11.5 air fuel ratio and i feel more power but know thats running way too rich.

When i say i unplug the O2 Sensor i mean i unplug the 4 pin coming from the wiring harness to the O2 Sensor.