Working on an 07 F-550, with the 6.0, and 229,*** miles. The dealer recently diagnosed a bad EGR cooler, and bad #2 and 6 injectors. I did the EGR delete, and new oil cooler, and also replaced #2,4,6, and 8 injectors, since I had the valve cover off. The EGR delete I did, kept the EGR valve...