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If you bought the $21 aftermarket kit, throw it in the garbage. It creates a vacuum & will draw moisture into your distributor thru it's shrunken seals and ruin it. You must remove the Optispark assy to seal it and drill or replace the cap with the '95-'96 style. The seals shrink after a couple years and they leak like an old roof. Follow C4 Tech Tips and use Corvette Fever article for pic's.