Bought January 2020 with 93k miles. Owned it for a week and it starts sputtering. Codes were lean fuel and 5th cylinder misfire. I changed all the plugs, wires, gaskets etc. Been driving perfectly for 6 months. Then check engine light, car sputters, won't start. Problem was radiator overheated. Fixed radiator. Went to drive and started sputtering. Assuming radiator overheating caused engine to overheat and fouled plugs. Same thing, 5th cylinder misfire. Changing all plugs wires etc. again. It's going smoothly then I get to number 5 again and go to remove the ignition coil and it breaks leaving melted rubber deep inside tube. Got as much plastic and everything as much as possible and I'm a little past the top of the plug and rubber won't budge. I'm assuming it's melted to the walls and plug. Any help with a solution would be GREATLY appreciated!