I have issues with some codes

[russiankazka]

I have a check engine light on, and when scanned the code tossed is p0303 and p305 On April i changed all the spark plugs and injectors. Suv doesn't have any weird noise, doesn't have resistance doing trails, is not getting hot either but still have that misfire code. Battery level is telling 13.8V which i understand is good. Do spark plugs dont last that long and need replacement? What else can make this troubleshooting? Autozone doesn't seem helpful they told me "they dont know"

 

[LibertyTC]

Old ignition Coil packs?
Standard Brand coil packs works well.
What spark plugs did you use?
Use brand NGK- ZFR6F 11G set gap at .040 inch

 

[blackhawk]

Misfires are present normally for the following reasons:
-lack of spark (coils, spark plugs, and rarely pcm)
-clogged injector or leaking injector
-low compression

Just swap coils and check, if dtc is present, swap the spark plugs.... And for the last, take all the injectors to be cleaned.