| ~1,100 RPMs after the engine warms up? P It's the IACV valve just behind the balance tube - find the 5/8 inch hose that connects to the rear of the balance tube at about the mid point and follow it back to the valve. FYI - After engine is warm, pinch the hose off with some pliers and if the idle drops you've found the issue. This is the valve and they eventually fail - so the the WD40 may not unstick it: [ http://www.courtesyparts.com/22660m-iacv-air-regulator-300zx-z32-1990-1996-non-turbo-1990-1996-turbo-p-31215.html?cPath=882& ]
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