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Look at your MAF readings at correct rpm (about 740), motor fully warmed up. I don't know what the MAF spec is for an S, but for the 2.7 its 15 kg/min +/- 1.5.
If you have significantly low MAF values, then its probably likely you have a vacuum leak. Check the usual suspects, AOS, oil filler tube, intake plumbing before the intake plenums, evap system.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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