The hi voltage supply is diverted in groups of 2 or 3 injectors depending on engine size (no of cyl), so the problem would most likely be in the supply circuit or the ecu, but you should call your tech.
Do you have any codes?
Have you had any bad fuel, or water in the fuel?
techs have been doing the work they have checked the harnesses and changed the ecm it ran a couple of mins with a new ecm then put up the codes again 226.5,227.5 and 228.5 solinoids for 4,5 and 6. a plugged injector won't leave an error code so bad fuel is a long shot.
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