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Look at RPM, MAF, ignition timimg, Tra Fra to check for a vacuum leak. Low MAF reading plus fuel trims in the plus area (2-4) indicate a vacuum. leak. Take off the oil cap and see how the values change, you should get fuel trims going up, MAF going down.
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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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