I've got a 99 7.3 with 180000 on it and it has started missing in one cylinder it started out of nowhere one day so I parked it and the next morning it ran fine until it warmd up then it started again and hasn't stopped since. I thought it was a valve cover gasket because I've had issues with it before but I replaced the one And it still misses. It started a few days after I installed a ts 6 position chip and I was running it on 50 hp. I used my old sct 3015 flash programmer to pull the dtcs and it gave me several icp codes and one icm code but I think they were from running the sct because there were also a lot of tranny codes and boy did it f*** with my tranny I would not recommend using this programmer but I cleared them and they haven't showed up since. The only codes it shows now is a misfire rate exceeds emissions and an electrical feedback error but that code is intermittent as well. Any ideas?