It's running rich when it's cold and the air injection system is running. When that shuts off so does the extra fuel and then clearly it becomes lean and idles poorly. That's a symptom of a vacuum leak ... and anything else that can create a lean condition.
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Kent Christensen
Albuquerque
2001 Boxster
2007 GL320 CDI, 2010 CL550
2 BMW motorcycles
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