I recently bought a used 5ek with unknown history. We put it in the truck runs good but we can't keep it cool. So I hooked up cat et and i saw fls fts was 127/0. So I changed it to 79/-19 and I noticed that the tattle tale feature showed these settings were changed 66 times !! It runs a little cooler but I took a look at the injector codes. This is what is listed cyl. 1100, cyl2 6930 , cyl3 6822 , cyl4 1781 , cyl5 1035, cyl6 1667 . Does it seem that those codes are in cal 2 and 3 ? Also what else can been changed with fuel settings ? It will haze black smoke when staying in the throttle under full load after that first initial puff of black smoke. Any help is appreciated I don't know very much about these older e models.