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You could disconnect the MAF sensor wiring and see if the car runs better without it. My understanding is the car reverts to a set of stored lookup tables when it looses communication with the MAF. If it made a difference you could focus on the MAF. My local Porsche mechanic says he's never seen a MAF sensor successfully repaired by attempting to clean it. I bought some genuine MAF cleaner for my car but it didn't do anything. A new MAF solved my problems but I'm not trying to say your car has the same issues.
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