Hello everyone,
 Well after 2 trips to the Bus Depot this week we've now replaced:
O2 sensor
new wires (Bosh)
Temp sender II
cleaned throttle body

And still the idle is not correct ..it isn't surging but it is climbing
to aprox.2700 RPM's and holds steady We are running out of ideas and I'm
not sure whatto try next. Does the carbon canister have any bearing on
the vacuum? Previously a tube coming from the canister would make the
van run rough if it came off now it makes o difference on or off.I would
like to take her to get her checked ot but affraid to drive with this
problem and no one local works on VW's.
Thanks for all the help I've recieved so far and any  ideas would be
great.
Jaime
88'Vanagon GL