Idle went haywire last night, possibly the o2?

[Tony Hoffman]

Yep, definately check for a vac leak. Usually a hunting idle indicates
there is one. I recently found vac leaks on two different 4000Q's, one
of them an 84. It's leaks were the diff lock switch, the vac advance
diaphram, and one vac line that had fallen off right by the throttle
body. It's easiest to check with a vacuum pump and guage.

HTH,
Tony

On Fri, Dec 3, 2010 at 3:27 PM, Johnny B <pre95 at live.com> wrote:
>
> Hmm... well here's the thing, my idle switch has been bad for some time now awaiting replacement (now bumped up in priority) but the idle has remained pretty solid (using the static adjustment to compensate). Now after months of this, the sporadic idle creeps up on me. I'll be doing a thorough check of all vac lines again (ISV & X + all rubber lines have already been replaced, possibly something came loose) and will also inspect the wiring to the ISV. Maybe it's time for a good cleaning as well..
>
> Thanks for the help!
>
> Johnny
> Pre95