just had this problem. I had a major exhaust leak between the headers and cat so it was throwing off the O2 sensor. I had a misfire on 1,2,3. At first it got better when the car warmed up. I have headers, and an aftermarket exhaust so I didn't notice it, the car is loud as it is. Hope this helps.
Cheers.
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1997 Boxster 4.2L Audi V8 Bi-Turbo
2003 911 C2
NASA HPDE Instructor
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