I have a 06 5.9 swapped into an Excursion. My dad gave me the motor. Long story short it has a Modified pump from Floor it. Other than the pump it is basically stock. The fuel pressure was fluctuating to a point where it was barely tolerable to drive at cruising speeds because of the surge. I tweaked the MA table and it is much better now but the pressure still seems like it fluctuates a lot. I am not sure if I should keep trying to fine tune the MA table or if I need to try tuning the PID parameters.

CMB_0072.efi