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This could be an air leak around the throttle plate. Try blocking off the AAR,AAV and Decel valve. You can block off all three at the same time by removing the hose connection at the back of the air boot (which connects the air flow sensor and the throttle body), and plugging both the hole in the boot and the end of the hose you removed. This is the hose on the right front of the boot. If your idle drops back to normal, then a fault in one of the three, or a loose hose connection will be indicated.
It will take a little maneuvering to do this, as there is not much working room there...
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Jim
www.jimsbasementworkshop.com
(CIS Primer for the 911)
(73 911T (RS look) coupe)
(Misc. 911 Parts for Sale)
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