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Hook it up to a Durametric (or possibly other readers.) If the MAF reading is significantly below 15 kg/hr, then almost positive its a vacuum leak. Another cause of vacuum leaks is a fault in the evap system (something I am chasing down now) or a broken oil filler tube.
If the MAF readings are near 15, then it could be a bad MAF sensor, or fuel delivery problems, e.g. fuel pump, pressure regulator etc.
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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
Last edited by san rensho; 01-08-2014 at 02:34 PM.
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