Sounds like a misadjusted throttle position switch.  BTDT.

Karl Wolz

----- Original Message -----
From: "J. Andrew Eichelberger" <jae13@CORNELL.EDU>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, April 13, 2002 8:31 AM
Subject: 2.1/1.9 mix

> Hi all--
>
> I just replaced my 84 Vanagon's blown 1.9L with a Boston Bob 2.1L rebuild,
> and am having a small problem.  The core, starter, and throttle body are
of
> the 2.1 variety, but I used the coolant system, exhaust, and Digijet
system
> from the 1.9L.
>
> When the engine is not loaded but also not at idle, it can stutter and
> sometimes get into a resonant mode where the whole car starts shaking and
I
> have to push in the clutch.  The problem is worst when you're just
puttering
> around town at a constant 20mph or so--you have to watch it like a hawk so
> you can push in the clutch at the first signs of shaking to keep your
> passengers from getting shaken around.
>
> The engine performs beautifully at idle, when accelerating, or when at
> highway speeds high enough to keep it under significant drag load.  It
> happens at any engine temperature, and the clutch and transmission are
new.
>
> A recent ebay ad for an air flow meter implied that it could cause a
problem
> like mine--that the spring/damping chamber can wear out and cause it to
> flutter.  Mileage is worse than my 1.9L (~17 instead of ~21 for my driving
> style), but Greg's Auto Repair (Natick, MA) set it up and said the
emissions
> are extremely low.
>
> Anyone have any advice?
>
> Thanks----------------Andy
>