Cylinder 4 misfire code

Question

Engine light keeps going on and the code reads cylinder 4 misfire so I change the spark plugs and then changed the fuel injector and I'm still having the problems. What next?

Answer 1

Misfire code means that cylinder is not contributing, sparkplug can cause a misfire condition, the fuel injector can also but misfire are mostly ignition  related, such as the ignition coil  .What you can do is swap the number 4 ignition coil with another cylinder clear the code, if the misfire moves , the ignition coil is at fault

 Here is an example of a ignition coil   even though this is a Toyota,