It may well be.

I had that part out on the bench, cleaned it up, (it was rusty)
re-installed, adjusted many times. I've tried setting it close uber close
to throttle stop ( 0.05 mm) and slightly further (currently 0.02 mm IIRC)
than max of 0.01 mm. Same symptoms. Sometimes it's ok though.

After I check and adjust the idle and timing again, I'll look into a fuel
pressure test. The idle stabilization seems to work but will double check
that after. PO had left the PS sensor dis connected. But that part in idle
stabilization circuit shouldn't cause surging when traveling in a straight
line..... I think.

Neil.

On Wed, Jun 13, 2012 at 10:37 AM, Karl Wolz <wolzphoto@q.com> wrote:

Coming in late, so may have missed this, but sounds like a TPS adjustment
> to me.  Or maybe I should go back into my hole.
>
> Karl Wolz
> Sent from my electronic umbilicus
>
> On Jun 12, 2012, at 11:31 PM, neil n <musomuso@GMAIL.COM> wrote:
>
>

> > The cap is installed but made no difference to the slight-medium surging
> at
> > ~ 2K RPM's, foot off gas, or foot lightly on gas.
>

> > .... It may simply be a worn throttle shaft
> >  (video: http://www.youtube.com/watch?v=aEGAgefVyQY ) affecting ability
> to
> > get an accurate throttle valve switch setting, but the way I have the
> > switch set now, (hair past specified max of 0.10 mm)  I know it closes at
> > idle every time, engine cold or warm.
>

--
Neil n

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