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 the ECU keeps moving from one side of 'ideal' to the other ... that is,
it'll
make the mixture richer until that's too rich, then move down toward
lean until it's too lean, then move back toward rich again, and keep
on doing that. which is one of the reasons the idle seems to kinda
'lope' at times.

hope it helps.
joel

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Regarding idle hunting as being normal:
I've heard this before (on list)- that it is normal for the idle to
fluctuate.
This may be the way the digifant was designed, I don't know.
But it seems very sloppy to me.  You would think that the frequency of the
feedback loop would be high enough to smooth out noticable variations.  I
don't see idle hunting on all vans either.

Gary Lee