Do you still have cats on your exhaust? (Plugged up?) could be o2 sensor also.. I had this issue with my 4.6, and then I changed out exhaust, went cat-less and done an rear o2 delete, with help of my sct tuner, I turned off my rear o2's, and cleared my codes, and they haven't popped back up.. One code can throw a few codes.. For example; bad plug (misfire) may also throw code for air/fuel mixture, and throw codes for o2's.. All because of a plug..
5.0l auto, swapped out with 4.6l 5 speed, summit cold air, 17"saleen, cat delete, rear o2 delete, H-pipe, 94 body and rear end, 99 everything else..