I have the new injector in 4 now and the injector from 4 in 5. Getting only misfire on 5 and lean code. I have ordered a new 02 sensor I found for $40 on ebay. If this doesn't work I am thinking it must be the cat. Is it possible to replace the catyltic converter with a straight pipe? or a universal maganflow? really don't want to pay $1000 for a new cat.