If the car is failing to supply the correct A/F mixture, its normally fair to assume that the CATS are also fried (or soon to be).
Clean your TB and air intake, run the official PIWI tests for both A & F delivery. If those tests passes then start the car and run it - not before
(if it'd be me/my car)
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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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