My name is moiz and I currently own a 2002 Toyota echo 1.5 liter engine. So the other day the car starting jerking and i realized it was time to change the sparks. When i took the old ones, they were completely out. I replaced it with some iridium NGKs. Later that day i was driving to school and it started to jerk again. So i took it to the mechanic and he diagnosed the check engine light. The error code came out to be P0305 cye #3 misfire detected. I want to replace the ignition coils myself so how do i know which coil exactly it is. And does the #3 indicate that #3 ignition coil went out? Thanks for your time and patience. Hope to hear from you soon.