When I replaced the cylinder head gaskets on my 1983.5 water-cooled
Westy, I bought a gasket kit that contained gaskets for the intake
manifolds as well as the cylinder head.  Pictures of the intake manifold
gaskets are here

http://communitybuilders.dhs.org/craigoda/vw/intakemanifold/index.html

There are two different gaskets that fit over the intake ports of my
cylinder head.  One is thin cardboard.  The other one is about 3mm thick
and made a black hard substance that looks like plastic.  There is brown
paper on each side.  I think that the thick black one is the proper
gasket to use.  If this is correct, what is the thin cardboard gasket
for?  It fits perfectly, but I think it is too thin.  Unfortunately,
when I first assembled the intake manifold, I only used the thin
cardboard gasket.

Right now, I'm having some problems with cold-idle and I've checked for
vacuum leaks.  I've ordered new fuel-injector seals, but these will take
a few days to arrive.  In the meantime, I'm planning on take off the
intake manifold again and putting the thicker gasket in place.  Should I
put both gaskets on?  is there any chance that this might solve my
problem?

Thanks, Craig.