Intermittent misfire in cylinder three?

I have a frustrating issue with my car. When I turn it on it idles perfectly and when I rev the engine it sounds totally normal. When I am driving is when the issue arises. When I am accelerating it seems slower than normal to accelerate and if I push too hard it feels as if the engine "wobbles" then it stops when I am up to speed. It is especially prevalent when driving up hill. I was driving up a fairly steep hill and was accelerating to get back up to speed but the engine kicked and that led to a misfire. I pulled over and turned the car all the way off, waited about a minute, then turned the car back on and it was fine, but the check engine light was on. The spark plugs are only 4 months old, and the ignition coils are only 7 months old. I have only added about 5,000 miles since the ignition coils were replaced. My car has a skyactiv engine if that makes any difference. I am having a mechanic replace the cylinder gasket soon because oil is getting in the cylinder 3 head and maybe that is the issue and causing the spark plug to become soiled. Is there advice and what else I could get checked? I don't want to spend hundreds of dollars on work that doesn't fix it.