hey paul, thanks for the reply.. wen i resetted the pfc initially, O2 feedback sensor was ON, however there was another setting below it, O2 sensor reg which i assume is a regulator etc.. this was OFF by default and i was wondering if that could be the cause of my weird zorst tone.. car doesnt hunt on idle but clearly lacks power.. do u think i need to reset the ecu again and have the O2 sensor reg. turned ON and then have the car re-learn over 30mins? sensor status on the hand controller shows all clear and working..