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The vg30 engine electrical system is notorious for corrosion.
Try cleaning the CAS plug, PTU plugs, and most definitely the injector plugs.
But since you've narrowed it down to cyl. #3, start with just cleaning the injector pins and the harness pigtail for that injector.
More than likely your car has "old style" square clip injectors which are prone to failure from corrosion and the ethanol content in the gas of today.
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