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2002 S6 Avant with 67K. Timing belt, tensioners, rollers, pump etc, plugs , filters and oil changed in January @ 62,500. CEL light came on Sunday while driving highway speeds. No effects noticed. Diags revealed cylinder 8 misfiring. Swapped coil and problem stayed with the cylinder ... plug looked good ... running Bosch FGR6KQE. Reset light and have driven for a couple of days and hasn't returned. Any ideas ? New Guy
 
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