D dragonslayer New member Jul 16, 2009 #1 Just had a tune up, cat conv previously gutted, just installed new one yesterday, still running rough and bad gas mileage, do I need to replace front and rear o2 sensors?
Just had a tune up, cat conv previously gutted, just installed new one yesterday, still running rough and bad gas mileage, do I need to replace front and rear o2 sensors?