If the plug wires are original, they can often become 'frozen' to
the ceramic portion of the spark plug. The best method of removing them
is two use the plug wire puller you have and use a twisting motion to
break the seal between the two. Than pull outward. Most likely some of
them will get damaged, and at this milage it's good idea to replace
them. There is also various other plug wire tools available, that may
work better on certain ones. The trick is to use a different
combination of pullers, and angles to get "stuck" plugs wires off. When
replacing with new ones, you should lubricate the tip of the spark plug
with dielectric grease, to keep the new set from freezing in the
future.
-Rip
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