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,
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