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hunting idle and gas fumes

  • 1999
  • 911 Carrera
91 000

My 99 996 has had considerable work and is a stunning red coupe. I do not drive it much and have recently developed an odd eratic idle and a real toxic gas smell.  The gas mileage, the little I drive it, is peally poor. It seems to be running rich. Tiptronic, 91K and will break up at high revs while driving fast. Any thoughts?

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