You have to determine what's causing the misfire first. Check the injector. It may not be supplying enough fuel to the cylinder. Do a compression test on that cylinder to determine if the rings are worn or a valve is leaking. All these parameters affect a misfire ...not just the spark plug.
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You have to determine what's causing the misfire first. Check the injector. It may not be supplying enough fuel to the cylinder. Do a compression test on that cylinder to determine if the rings are worn or a valve is leaking. All these parameters affect a misfire ...not just the spark plug.