i don't want to presuppose your mechanical skills or troubleshooting prowess. however at some point ( if it were me ) i would stop trying all the "do this, do that" and get a professional opinion.
that said, have you checked the oil level?
http://986forum.com/forums/showthread.php?t=24415
http://986forum.com/forums/showthread.php?t=24564
http://sites.google.com/site/mikefocke2/checkenginelightcausedbymassairflowsensor
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