this problem im having started right AFTER i relocated my battery to the hatch. the car will be running normally, for example at a cruise the A/F is at say 13.7 and will go to 11.0.....while cruising????????(A/F is measured with a Tech Edge WBO2 that was dead on with the dyno A/F i pulled on) then at other times it will go lean, it does this at idle too, perfect one minute, rich another and lean another? the battery is grounded with a 1/0 cable to the quad shock mount and charges strong and starts strong so i dont see it being a bad battery ground. i grounded the motor from the stock timing cover spot to the sway bar mount with a 2ga cable, i then grounded the ECU from the stock spot to the swaybar mount with a 10ga wire. Pro-M recommends i run another 10ga directly from the battery NEG- up to the ECU ground. could this be my problem? BTW the O2 sensors have been replaced(normal maintanance) and this problem has occured with TWO different Pro-M 80mm MAF's so you can pretty much rule these out.