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Your AAV should close completely when the engine is warm.
To eliminate this "issue" simply bipass the AAV. If your car idles correctly you have found the problem. If not, leave the AAV blocked off and continue your search one component at a time. You can come back to the AAV after the idle problem is fixed.
Does the diaphragm run a vac line to the distributor? If so you could be advancing the timing under vacuum. Could also be the AAR. There are several different smog bits on the various engines produced that year. Do you have a schematic for your engine that identifies the components?
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
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