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I had similar codes, same problem. Save yourself a lot of time and money and just replace the MAF sensor. The MAF sensor has its own codes that never came up for me which made me look in other directions before I finally just replaced the little bugger and was done with it. My car wouldn't rev past 5k rpm or so. It would spit and backfire. Very frustrating when you're driving a Porsche. I'd clean the MAF sensor and it would run well for a few days then go back to the same old story but it never threw a MAF code.
Do you know how to access the engine? Takes just a few minutes. The MAF sensor is held in by two screws (takes a special "safety torx" bit to remove). You can buy MAF sensor cleaner at the auto parts store for 5 bucks. If you remove and clean the MAF sensor and your car runs better for a while then goes back to the same problem, voila. The MAF sensor was about $270 from Pelican which was, ounce for ounce, more expensive then drugs but far more satisfying.
After I replaced the MAF sensor, it was like driving a new car.
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