It sounds just like vanagon syndrome. You can google
those two words, but also check out this link and see
if it matches your experience:
http://www.telusplanet.net/public/gary2a/rack/afmharness/afmharness.htm
. The link also has pictures of the factory fix, if
you have it is less likely its the problem.

When I first encountered it -while using cruise
control-  the real clue was that I could turn off the
ignition key, restart and it would be gone- until the
next time.

HTH

Tom F.

--- SKP <skp@ONSHAKYGROUND.COM> wrote:

> Sorry, get caught up in the details.. Its an 87
> Synro, Manual transmission.
>
>
>
>
> On 7/29/06 3:56 PM, "SKP" <skp@ONSHAKYGROUND.COM>
> wrote:
>
> > I am hoping someone can shed some light on
> particularly difficult problem.
> >
> > When driving on the freeway for a while, I have an
> abrupt bucking/misfire.
> > It is very specific in that it happens only when I
> slightly let off the
> > accelerator and will go away for a few minutes if
> I press the accelerator
> > firmly  or release the accelerator.  Sometimes
> this behavior will continue
> > until I stop the car or may simply stop the
> behavior on its own.
> >
> > The only discernable pattern is that if the road
> requires acceleration and
> > deceleration, the problem doesn�t surface.  If
> there is a steady constant
> > speed, and I slightly lift the accelerator, the
> behavior begins.
>

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