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I think I know what's wrong. I had the same symptoms when I owned a 1985 928S. I'm no mechanic, but I think the part is called the throttle body. Overtime, it sticks due to build up of residue, etc. There are sprays you can purchase at any auto store to lubricate and clean the throttle body and then you should be fine. Now, I have no idea where it is located on the Boxster.
Good luck!
Eric
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