F54 All4 S w/ 165k miles. Cylinders 2&3 misfiring. Swapped coil packs. Misfire stayed on 2&3. Replaced all plugs (they were due), misfire stayed kn 2&3. Only other thing I can think of is the injectors. Question when replacing just one or two injectors, is it really necessary to pull all four when only replacing two?

Thanks in advance!!

 

Not completely, but if you think about it, you have high miles with what appears to be (2) failing injectors...how much time before the other (2) start to falter? I would replace all (4) and be on your way. While you are in there, might as well take care of all of them vs having to do the job 2x, IMHO. YMMV.