The only thing that comes to mind is that when the MAF goes it can cause the plugs to foul which could then lead to other problems. I'd have them check that. I know my shop originally tried cleaning several of the plugs only to have them foul again in a week.
Just a thought..
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'06 Cayenne Turbo S, Beige Metallic/Tan
Ex - '99 Arctic Silver, Red Interior, Silver Top
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