hey peoples, my car is throwing these codes and i was wondering how do you know for sure if these cylinders are really misfiring? is there a certain way you can test them? i don't get these codes when my car is set at stock timing on the cam gear and the fuel is set at stock psi, but when i take it and tune it, it throws these codes. also it takes about a week from when we tune it to throw these codes. I was told that with certain tunning and mods to the car this is normal for it to throw these misfire codes.