Had the same symptoms after cleaning the throttle body and knocked out a vacuum hose accidentally. I can't remember where, its my independent who've managed to locate it and reconnected it. It must have been near the TB assembly.
Vacuum leak symptoms: Sort of running okay when pressing on the gas pedal but idling quite badly and staling occasionally especially when getting near and at operating temperature.
Unhelpful I understand but I thought I'd share a similar experience. Start with the easy part and rule out a damaged vacuum hose or fitting before doing anything else.
GL with getting this fixed.
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
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