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Bought January 2020 with 93k miles. Currently 97k 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!
 

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From the sounds of it, you'll probably be best served by replacing the valve cover. They are fairly cheap, and you probably could pick one up at a recycle yard even cheaper.

While you have it apart, pressure test the cylinders. There appears to be an issue with # 5, wither it's burning lean or a malfunctioning exhaust valve that's causing it to run hotter then the other cylinders.

Check # 5 fuel injector for proper function. You'll need to remove it for proper testing to check for proper flow and pattern.

With the cooling system fully operational, it was keeping # 5 just cool enough from it's own excessive heat.

Good luck.

Have a good day.
 
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2011 Nissan Murano LE AWD
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Bought January 2020 with 93k miles. Currently 97k 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!
This video may help with your current predicament:

Let us know if you're successful and what you did to get it out. PaulDay also had some good advice.
 
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