I also had similar symptoms-occasional very high sustained revs- when water
got into the idle control unit behind the tail light. It was sitting on the
'floor' in that compartment instead of up in the air and was all wet.
Replaced and all better.

Joe

On Fri, Oct 11, 2013 at 9:08 AM, Ed McLean <email99@bellsouth.net> wrote:

> There is a thread (Re: ISC troubleshooting) in the archives addressing an
> idle circuit problem that gives similar uncontrolled 3000 rpm symptoms to
> those you are observing.  I found heat inside the idle control unit behind
> the right tail light contributed to the problem.  My experiences and
> attempts at fixing this can be found in Item #394156 (21 Feb 2010 18:13) -
> Re: ISC troubleshooting.  Sometimes electric motors begin to draw more
> current as they age.  Maybe the idle control valve is doing the same thing
> and causing the control circuit to overheat.
> Ed
>