I  had an O2 "event" this week is why that occurred to me.  Just got
through rebuilding my 87GL or so it seems....hmmm coming up on 1500
miles now. It was my first rebuild ever, so I'm feeling real proud!
(Started working on the inside now, and still have the steering rack,
and a/c to do).
Anyway...
The van had been running fine, and then one day I took it out and it
jumped and hesitated greatly.
I thought through my previous actions, as I had just been checking it
out and bleeding the coolant.
I remembered that I had pulled up the 02 wire because it was touching a
hot spot.
Sure enough, even though the wire "looked" connected, the rubber cover
had put on enough pressure to loosen the connection inside!
It was great to think that my hard efforts to "learn about" this car in
the last year has maybe started to pay off!  I really felt "connected"
to the workings of the car finally.
Good Luck!

"M.R. Nimmo" wrote:

> Next task.  I just thought the timing was odd.  Forgot
> to add:  it backfires when it stumbles coming off
> idle.  I was also told to check all vacuum lines and
> perhaps the distributor.  Any thoughts?
>
> --- Anthony Kimmons <akimmons@pdq.net> wrote:
> > Checked that O2 sensor?
> > ���
> >
> > "M.R. Nimmo" wrote:
> >
> > > >>>I was hoping someone could help me out with a
> > > "stumbling" '87 GL named Rosa.
> > > Seems that as I accelerate...I've cleaned the
> > > wiper arm and track on
> > > the AFM and it seemed to have helped but not
> > > eliminated the problem.
> > >
> > > Chris,
> > > I have the exact same problem, but it appeared
> > > immediately AFTER I cleaned the AFM per Mtn.Gal's
> > > specs.  (Where is she anyway?).
> > >
> > > Ray
> > > 84 sunroofer w/ wolfy weekender interior
> > >
> > >
> >
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> >
> >
>
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