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Q: Check engine light came on with noticeable what I believe is fuel injector tick
on 2005 Ford Expedition

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Also note slight hesitation/miss on acceleration on mild incline.
(2) Answers
If you believe the fuel injector is bad you can unplug one connector at a time from each injector. If there is a change in the idle or it runs worse/rough the injector you unplugged is a good injector. Plug each injector back in after checking it. If you have a bad injector the engine will not change idle when unplugged. Of coarse the engine must be on when checking these.