All,
  Working on a 91 Automatic Multi-van.  Just got done changing all the fuel
lines in the engine bay.  Now I have this terrible off idle hesitation.  Put
it in gear and it stalls.  It did not have the problem before the fuel line
change.  Weird thing is, if I restart, it runs fine.  As I poke the
throttle, it gets worse and worse until around the 45 second time frame when
it's just ready to stall as soon as you give it just a blip.  Shut-off and
restart, runs fine.  I thought I had some air in the lines so I ran it on
the road and some high idle time in the lot.  No change.  I thought maybe I
accidently unplugged a vacuum line but I havent' found any.  I checked for
leaking fuel and have found none.  All the clamps are down and tight.  Any
advice would be much appreciated.  Pmail me (x53gunner@gmail.com) as I'm in
a slight time crunch.