I just had a D16A8 put in my AWD 91 Wagon but the engine seems sluggish. The engine through a o2 sensor code and I have read that the Rover D16A8 used a different sensor (Co2?????) compared to the o2 sensor? Also should I have used a ZC ecu instead of my Si ecu? Could one of these be causing the engine to be sluggish? My 1.5 DX had more pop than this D16A8. Any help would be greatly appceciated? I am new to this.