sure sounds like an AFM issue to me.
since you have two.........perhaps you could try bending the sweeper arm on
one to make it rub on a new portion of the thing it rides against....
and see if that works.
I had one customer's syncro vanagon that 'cut out' ...........not really
though..........was just uneven right at 3,100 to 3.200 rpm.
I held off from doing a new AFM, but when I did.........that was it.
and the way the gear ratios worked out...........most of the time at medium
throttle,  you were right at the rpm too.

can't imagine it's throttle switch since you're not at idle or at WOT when
it does it.
something weird with oxygen sensor jumps to mind.
I'd be very surprised if it was anything to do with temp sensor........but
I'd consider that at least.
never forget to look into air leaks or course, though I doubt that's your
problem.
oh, and ground connections ! ..........make sure ALL grounds are clean and
tight.   And corrosion in all ECU wiring harness plugs.   Especially the one
to the temp sensor.
Scott
www.turbovans.com
----- Original Message -----
From: "craig cowan" <phishman068@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, November 03, 2008 9:30 AM
Subject: bucking at 2K rpm

> Hello guys.My '85 is running so astonishingly well, i have nothing to
> complain about except that it tend to buck a little at or just above 2K
> rpm
> if you hold it there for a considerable amount of time while the engine's
> warm. It's ONLY at the 2000-2200 RPM range though. I thought it was the
> AFM,
> but i put in a spare and the symptom is exactly the same. I don't know
> that
> the spare's any good, but the fact that the symptoms are exactly the same
> has me thinking that's not it. So what do you think? Temp 2? O2? Throttle
> Position Switches?
> Any thoughts? I have really no running issues aside from that bucking from
> time to time at that specific RPM.
>
> -Craig
> '85Westy