what secondary reason is there for coils to misfire?
I have a Toyota Celica and i have changed all four ignition coils and i have already
changed my valve cover gasket and my check engine light is still on and not only that i
have ran the codes and it states that all four of my ignition coils are misfiring. I was
recommend to change my valve cover gasket asap but i have already done that, so my
question is what else can the cause be for my ignition coils to misfire?