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Diagnosis makes no sense. If its a misfire of the plugs or coils, you will at least get codes, if not a CEL. I would look first for a vacuum leak or bad fuel pump. Or possibly a bad MAF sensor. All of those problems can result in bad running without throwing codes.
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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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