There is no secondary throttle plate. ~3200 is where the cams change timing/lift toward high RPM profile. One of your cam solenoids may be malfunctioning. I would think it would throw a code.
Buy a Bentley manual for your 996.
Porsche 911 Carrera (Type 996) Service Manual: 1999, 2000, 2001, 2002, 2003, 2004, 2005: Bentley Publishers: 9780837617107: Amazon.com: Books
Or "Porsche 996 the essential companion" This has a lot of information less DIY
Porsche 996 The Essential Companion: Supreme Porsche: Adrian Streather: 9781845840969: Amazon.com: Books
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
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