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79 SC high idle, AAV?

Fuel System

Vehicle Information: Model: 911SC; Year: 1979; Body Type: Coupe; Total Mileage: 64000;

My car, after warm up will idle about 1800, occasionally it will idle normal after a slow drop in rpm from 1800. I can force the idle down with the clutch and it will stay there. Since it stays there after forcing it down I'm assuming no vacuum leak. I've read some posts and am thinking it could be the AAV. Am I correct to start with the AAV? If so where is it and can it be tested on the car and is it accessable to remove with engine in. If not AAV any suggestions where to start? Any help would be appreciated.

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