Ok I was on my way back from work and my truck was lacking power big time. I gave it a little throttle just to see what it would do and my CEL startined flashing so limped to the orielys down the road and had the codes checked one of them was p0171( bank 1) and the other I can remember but it was cylinder 2 misfire. So I changed the coil on that cylinder but its still throwing that misfire code and the other but it runs like it did before. I used three different code readers and they all confirm one another. help