Just got off the phone with my brother-In-Law and hes having a few issues with his 6.4. He started it this morning to let it warm up. He said it was running fine for a few minutes then started idling very rough some of his dash lights turned off. He started it back up after a few minutes and it did the same thing. Ran fine then turned back to a rough idle. But this time on reverse and drive indicator lights turned off. He tried to put it in gear and it shifted really hard into reverse. When he put it in drive he said it felt like it was like trying to start out if 5th. So no power and rough idle after a few minutes of idling. Im thinking either the DPF system or HPFP for the rough idle. Just not sure about the trans issues. He did just have the EGT sensor replaced. Just not sure on which one though.