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I believe that my 1997 30th Anniversary Z-28 needs to have the spark plugs and wires replaced. Slight ign. break up over 5000 rpms. I tried local autoparts stores for the AC Delco plugs and wires and no one stocks them. The list price on the wires is $150.00! That is unreal.What are you guys using when replacing the plugs and wires? I know I can get some aftermarket wires for $80.00 or so. The engine is stock with no mods.Thanks!