Hi Frank,
    There are many things that can cause your problem. However when you
mention you have changed the O2, you unplug it and all is good. If your
throttle switch is ok   suspect your afm as the problem. Check the wiper and
carbon track it slides on,  may need to be cleaned or it is worn.

Darrell
----- Original Message -----
From: <RAlanen@AOL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, February 12, 2000 6:32 AM
Subject: Re: Hesitation

>     Same story on my '87 Westy.  Been like that since I installed the new
oxy
> sensor, generic Bosch, from The Bus Depot.  Unplug the black single lead
and
> the engine has no hesitation but does seem to consume more gas.  Plug in
the
> black wire and the hesitation comes back.  I also have the idle surging
> problem and have not tracked the cause of that yet either.  So I have no
> solution to offer up here, just confirmation of the same symptoms.  I have
> not had time yet to do a full check of the throttle body switch, the idle
> stbilizer valve, the idle stablizer control, air flow meter & harness or
the
> oxy sensor to see if any of thse items are out of spec and the cause of
the
> hesitation problem and surging idle problem.  I may get on it this week
and
> try to figure it out. I'll report back my findings when I get them.  All
> these electronic gadget just bug me, and I know a bit about looking into
them
> !  I can just imagine what someone who doesn't have a clue about all this
> electronic stuff has to go through to get these problems solved.  Good
luck !
>
> Cheers
>
> Frank Condelli
> '87 Westy & Lionel Trains
> Almonte, On
> Visit me on the web.......> <A
> HREF="http://members.aol.com/RAlanen/index.html">Frank, Rita & April's
Website
> </A>
>