Oopps! I almost forgot! Do Not over-OIL your air filter as this will release some of the oil and contaminate the MAF meter (hotwire). some dust may bypass the filter and stick to the hot wire, eventually will set a lean code PO171, system lean and make you FJ run like cr_p! Easy to Fix! LOOK at the MAF hotwires, if it is dirty,clean with contact cleaner and let air dry!
