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Engine barely runs, extremely rough idle and will not rev.

  • 2003
  • Boxster
96 000
Dade City, 

I recently returned from a 2000+ mile trip to PA and back during which the car ran flawlessly. On my return, I took it out for a brief time to do a little driving instruction with my grandson which we enjoyed together. He is a very careful learner and did nothing while driving that would have been any different than my own driving habits. I took over driving after about 20 minutes to return home and the car suddenly lost power and would only barely idle with occasional spurts of smooth rev spikes. I cannot find any obvious intake vac leaks. I had repaced the AOS before leaving on the trip. Any ideas/suggestions where to start looking would be very much appreciated!

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