Hello,
Having same problem in my 98 2,7 - wife has just had Porsche run the diagnostics on it, told to change the idle control valve (easily fixed by DIY clean) and to change the Tank pressure sensor on the charcoal filter assembly.
Main stealers would not clean the ICV only wanted to replace plus the pressure sensor coming to a cool 800euros.
Will DIY fix when I'm back there.
Try this before turning engine over when hot, release the fuel filler cap and then refit, try to start - if it works its the tank sensor or shut off valve in the filler neck.
See Renntech for similar items.
Good luck.
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