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Most likely, yes. The AAC valve controls your idle by letting small amounts of air into the engine. If it is malfunctioning, in all likelihood, it will be letting unmetered air into the engine off idle. Either that, or it is closed and forcing the ECU to work hard at maintaining a decent idel. This would likely make low end throttle response a bit poor.
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George Roffe
Houston, Texas USA
00 328i
91 SE-R (well modded)
84 944 SCCA ITS race car under construction
"I fear all we have done is to awaken a sleeping giant and filled him with a great resolve"
-- Admiral Yamamoto, December 7, 1941
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