Check the intake for debris. I know that this sounds painfully obvious, but I had a similar problem and struggled with it for weeks. Turned out to be some debris that was sucked into the intake and clogging the air flow. Its worth a 30 sec check just to make sure.
Have you checked the fuel pump for pressure and flow?
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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