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If you've moved the injector and the code remained on cyl 3, it's probably not the injector. If you've replaced the adaptor, it's probably not the adaptors.
Have you considered that it may be in the engine harness or ecm? The"injector circuit" is anything between the 12v supply and ground. If it's tripping the code for a single injector, that eliminates the efi relays and fuses and ecm ground (basically anything that is in common to all 4 injectors), so it's between (and including) the concerned injector's splice on the red efi main1 12v rail and the driver in the ecm.
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