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removing spark plug in aluminum cyl,head

I am not sure if it is better to remove them when the engine is hot or cold?

The reason I am asking is I am doing A tune up and had some problem with the replacing the plugs and one is really in there and I am afraid of the stuck plug braking or striping out.

So what is the best way to approach the problem.I have the big tools to relay put some torque on it.I feel some fineness is in order.Thanks for any wisdom.


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