is my po305 code the sprak plug, fuel injector, or coil problem

Question

po305 code is it the spark plug, fuel injector, or coil, Feels like an older engine wire or spark plug, misfires when under a load, but when down shift, some times clears up.

Answer 1

HI there,

Most of the time a single cylinder misfire is the result of a faulty ignition coil. You can try swapping the coil on #5 with one of the other coils, if the misfire is still there, then it's not the coil. If the misfire moves with the coil, then you know the coil is the problem.