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I've experienced the same thing myself. In my case it started out as a poor idle before the engine went into closed loop. I caught it before it progressed to the point the engine wouldn't run by unplugging the MAF and saw that it improved the rough idle. This happens so often that unplugging the MAF has just became a routine part of troubleshooting a poor running Reatta engine. Just like testing the fuel pressure and looking at the ICM for the green/gray goo on the side, disconnecting the MAF to see if it improves how the engine runs is just something you learn to do. Just checking the MAF readings in diagnostics undoughtedly doesn't tell the whole story of what is going on inside the MAF.