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Codes for #1 and #8 are not what I would expect for your intermittent failure because those injectors are fed by two separate FICM connectors (X1 and X2, respectively). I was expecting 2 or more injectors on the same connector.
About the only thing that X1 and X2 have in common - other than being a PITA to seat - is a shield for both harness bundles that is grounded at the stud at the rear of the DS intake. You may want to check that is clean and solidly attached on principle.
2004 F550 CC Lariat
BPD oil cooler relocation and upgraded EGR cooler (spooled), BPD oil bypass filtration, aFe Magnum Force CAI, Mishi radiator, 7.3L fan clutch, EC1 ELC, XDP coolant bypass filtration, '08 trans pan/filter, PTP direct clutch solenoid, blue spring, 6.4 starter, MBRP y-pipe, BD boots/clamps, '05 intake elbow, ccv reroute, Torque Pro + OBDLink™ LX, Autometer EGT