Hi Craig,

I'm somwhat familiar with vacuum diagnosis.  AT idle, 850 rpm, and a
warm, ie no cold enrichment , my van sit about 13-14 inches.  The
operation or movement of the vacuum gauge is the meat.  A vibration
movement, worn guide, 2 points of movement slow, worn plugs, occasion
drop, valve /intake leak, constant low, vacuum leak/ timing issue.  That
the sketch.  If you'd like to gather more information on general setting
and tuning of the fuel injection, look under my last name in the
archives say 98-3003.

Mark Keller
 91 Carat