cant get the spark plug tubes out to change the bottom seals on 1995 Isuzu Rodeo

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how do i get them out without damaging them? cannot find what to do in the repair manual..
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ahhh, hence why theres nothing in the book about it. so oil getting into the bottom of the tubes and running through the threads into the chamber is from the upper seals going bad correct? leads to misfire and the cat going bad.