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1. 

   Spark Plug Reading...

   Bad valve stem seals will let plugs crud-up with deposits like that. I would only use the correct factory plugs - those say 'Iridium' on them, which makes me suspect they are a much newer plug design.

   • Words: 37
   • SteveH
   • Post #6
   • Jun 26, 2022
   • Forum: 60-Series Wagons