Part Numbers (PN) for Vac Hoses???

["Dan Sinclair" <sinclair@prospro.com>]

I've been resisting the urge to plead for part numbers from you folks, but
I'm not sure what else to do on this one.  I put in an order for an EKTA,
but hasn't showed yet.

There are 3 primary vacuum hoses that I'd like to replace (the stalling
continues...) but without PNs, I don't know how to go about finding
replacements.

-First hose runs from the intake manifold to the ISV (strait, about 8 inches
long)
-Second hose runs from the ISV parallel to the first, backward to the rear
of the engine block.
-Third hose connects to the second hose via. a plastic elbow and runs up to
the throttle body area (plugs into the underside of the rubber waffle boot -
this one has a double bend in it).

This is a 1988 Audi 90, 2.3l (NG) 2wd.

All hoses are about 3/4 inch inner diameter.  Any BTDT?  I've replaced other
vac lines to no avail.  Anyone had problems with these hoses?  Am I wasting
my time replacing these?  They seem to fit a little sloppy, and have been
sprayed with oil and grease over the years.  I figure it couldn't hurt to
change them out.

Thanks in advance.

Dan Sinclair
1988 Audi 90, 68K mi.
Photo and details online at:
http://131.107.68.28/a4.org/registry/details.asp?car=761