Misfire Code P0301

The other day my fan broke and the car overheated. I replaced the fan. Problem is, it sputters when I drive it. The check engine light did blink after maybe 20 minutes of idle. When I turned the A/C on to activate the fans. It made like a small tak, tak, tak, sound. Which was unusual and what concerned me. Turn it off, it stops. I carried it to the parts store and got P0301. Which is cylinder 1 misfire. There are suggestions from spark plugs. Ignition packs. The cylinder 1 coil is in the back under manifold. I’m not getting mixing in oil. The coolant isn’t firing up. The engine idles quite. I had the spark plugs changed recently Mechanic is a couple blocks away. Don’t want to move it. I’m kind of stuck on the best way to approach this. Thanks