Allan,
While idling, I would spray a tiny amount of WD40 or carb cleaner on the
suspected area. If a vacuum leak exists a change in the RPMs should be heard
as the engine tries to combust it.
Careful with flammable liquids and clean off painted surfaces promptly.
Ken Lewis
http://neksiwel.20m.com/

----- Original Message -----
> Looking things over in the engine compartment, I noted that one of the
> short rubber hoses on the intake manifold has some surface cracks.
> Can't tell if they go all the way through.  Are these normally replaced
> as a set, or just individually as needed?
>
> Allan
> --
> 1991 Vanagon GL
>