were they bosch,or ngk wires? There are alot of cheap,bad wires on the market.Check where coils plug into harness.I no longer use Bosch spark plugs,since they are not german made anymore.I have had the best luck with Denso,or Champion.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt