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Several yeras ago I had P1123 & P1125. Disconnected the MAF and the car ran better. Replaced the MAF, cleared the codes and have been fine ever since. In my case the MAF sensor had failed. Leaky injector can certainly also cause this but injectors are a pain to get to. MAF is cheap and easy.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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