Miss on Cylinder 3
 

My 96 Taurus had 271K on it. Just developed a P303 code, Cylinder 3 miss. I pulled the #3 plug Looks ok. Bosch 4+ Platinum replaced about 18K ago. The plug wire resistance is about 30K Ohms.

Could this be the injector? How do you diagnose injector problems. Any other idea? Thanks,

Don't know what equip you have to work with, but if you switch plug and wire with another cylinder see if the miss moves too. If not you can unplug the injector and see if that makes any difference. With that number of miles a compression test might be a good idea to pin down the problem.

Miss on Cyl 3
 

Those are a good ideas.

Thanks