first of all, 2001s do not have an idle control valve, its a fly by wire throttle body. Sounds like you have a vacuum leak. I would go back to the dealer with your old part and have them replace it with one that is identical and then go from there.
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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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