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It's amazing what a new set of plugs and wires can do.
Find a chart on what to look for when looking at old plugs. I have some old Haynes manuals that have color pics of old plugs in different conditions, and explain what issues in the cylinder cause this. Can be real helpful in getting a clue on what's going on inside the engine.
Cool! I have a haynes manual (the GM one actually) so I will see if I can find a chart... If not, maybe I can find it on the internet!