This may be a dumb question, but, have you checked out the Mass air flow sensor? My 97 base had the exact same issues, until I replaced the MAF. I had also replaced o2 sensors as well.
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'97 Boxster- LM Engineering IMSB, Euro clear markers, atermarket exhaust, de-snorkled, new top with glass rear window. 83,000 mi. on the OD.
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