Hmm, these are tough to narrow down. I would perhaps think about doing a smoke test to find possible vacuum leaks. At least that will eliminate them as a potential problem? I've got an article on this procedure here:
http://www.pelicanparts.com/techarticles/Boxster_Tech/21-FUEL-Vacuum_Leaks/21-FUEL-Vacuum_Leaks.htm
-Wayne
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Wayne R. Dempsey, CEO, Pelican Parts Inc., and Author of:
101 Projects for Your BMW 3-Series • 101 Projects for Your Porsche 911 • How to Rebuild & Modify Porsche 911 Engines • 101 Projects for Your Porsche Boxster & Cayman
Coming Soon:
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