it could just be an idle circuit or an a/c circuit
kicking in and adjusting the idle so that there is not
as much strain on the engine.

i know on my dad's subaru, when you turn on the a/c,
the idle speed is raised to counteract the effects of
the a/c compressor, and when you are just starting the
car in the morning, the idle is higher because a cold
engine needs a richer fuel mixture to combust properly
(or so i think)

so i don't believe that your problem is really a
problem at all.

my $.02 worth,

=====
Sudhir Desai
desa4622@kettering.edu   desa4622@yahoo.com
1984 Vanagon 3.4l v-6    1996 Jetta Trek
icq# 17014903

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