Just got off the phone with the stealership and they have moved plugs around and coils around and have narrowed it down to the #8 cylinder....could it have an oil ring for valve problem that would cause the idle to be off?

It only has 158K on it.

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Norm K.
'97 E420 Sport
'06 E350 Sedan
'67 Mustang Coupe
'70 F-250
'15 VW Jetta