http://986forum.com/forums/general-discussions/51323-random-starting-issues-cel.html
I had some issues with starting as well a couple weeks ago. Fixed it with the regeneration valve that I mentioned in my post that I provided the link for.
I bought it at the dealer for around 130 dollars but it was a massive pain to replace. Hard to get any good angles to get it out so I ended up taking half of the upper engine parts out to get to it under the intake manifold. Then you have to get to the bottom connection from under the car with the liner removed. Def recommend taking off your trunk lid to sit in it while you work. Made it a lot easier.
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