I'd say it's one of two things (both of which I've experienced with similar
symptoms) - either a problem with the injection pump mounting, causing the
pump to twist slightly and alter the timing, or a plugged air filter causing early
stages of runaway. Both are serious issues, so check 'em both - ie: check
those inj. pump bolts, and check your air filter...

On 11 Feb 2008 at 21:01, John Tyberg <Diesel-
Vanagon@yahoogroups.com> wrote:

> Alright, another question for the gracious diesel heads.
>
> In each gear, when my rpms get to the same level (I couldn't tell you
> what number that is because I don't have a tach.  Probably about
> halfway up the meter before I change gears--1000-2000rpm?) my engine
> gives this strange boost in acceleration and then returns to the
> normal amount of power when the rmps pass that window.
>
> In other words, my foot keeps the same pressure on the pedal, but
> suddenly the car makes a short jump in acceleration in each gear at
> the same rpm.  It's kind of unsettling and is causing my driving to be
> really jerky.
>
> Has this happened to any of you, and if so, what was the diagnosis?
>
> I appreciate any input. (Please write your input in idiot's guide
> language)
>
> thanks,
>
> John
>
> 1.6na 4-spd
>
>
>
>
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Shawn Wright
http://members.shaw.ca/vwdiesels
'88 Westy 1.6TD 5 speed
'85 Jetta Diesel 1.6NA