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Dewd, not so fast with pulling the head. Buy some Pblaster, and soak it for a while. You could try to get some movement out of it, and get it moving in both directions. If you can get it to move at all, go forward, and backward, with the pblaster on it.
Start the car, yeah, I know it will only be running on 3 cylinders, but desperate times call for desperate measures. Of course, it will run like crap, but what you want to do is get some heat into the area around the plug, and true it won't be coming from your problem cylinder, but it will still get hot. I just removed 4 stuck plugs this way today. The heat from the engine and kroil (penetrating oil) kept me from disaster.
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