Think I may have solved the issue. I found a pretty good message tread about EGR tuning for the LMM. Apparently disableing the EGR with EFI Live causes this problem. From what I understand you keep it enabled and change your parameters. Here is the link. Problems with B1501 set to 'Disable' - EFILive Forum I did not get to drive the truck much today but it has not happened since I made these changes. My check engine light is on but Im getting ready to go scan it. Just looking at my DTC enables I think I know what that may be.