I think 'vanagon syndrome' is used to discribe sudden loss of power and
even cutting out while driving.  In most cases the car comes back to full
life if you stop the car and re-start it.  Now this being said I've read
various solutions to fix these problems.... and I suspect that a variety of
problems are all being diagnoses as the dreaded syndrome.  By this I mean
not everybody's got the same problem, but same symptoms.

In your case, if the problem is idle related I suggest you keep your search
directed to idle related problems, and not the syndrome....

Regards,
Shawn.