I'll describe it as a random stumble at idle. Not rhythmic in nature.

On Fri, May 13, 2016 at 2:05 PM, Dennis Haynes <d23haynes57@hotmail.com>
wrote:

> Is it a "miss" or uneven idle? On the Waterboxer misses at idle usually
> indicate a balance problem. The cylinders are not getting the same air and
> fuel delivery. Above idle there is much more tolerance. You can have a bad
> injector, vacuum leak, or an engine problem. Intake valve issues are very
> common. You  can discount the O2 sensor and with the engine running ground
> the sensor input lead briefly. This will cause the system to enriched the
> mixture. If this helps then most likely you are dealing with what we call a
> "lean" miss fire. One cylinder too lean so the fuel doesn't ignite.  This
> unburned fuel can make the exhaust smell rich causing more confusion.
>
> Dennis
>
>
> > Date: Fri, 13 May 2016 08:24:47 -0700
> > From: tyler@SERAPH-NET.NET
> > Subject: Miss at idle?
> > To: vanagon@GERRY.VANAGON.COM
>
> >
> > Where to start?
> >
> > Distributor cap and rotor, plugs are < 500 miles old.
> >
> > Wires are < 1 year old (Bosch from Van-Cafe)
> >
> > Timing was done 6 months ago with a light at idle. I checked advance at
> > that time and it seems to work. P.O. had marked the main pully with white
> > paint.
> >
> > Yes, I lubricated the felt. :-)
> >
> > Temp 2 sensor is < 1 year old
> >
> > Probably easier to start a list of what I haven't done:
> >
> > Hall Sensor..
> > Coil..
> > Fuel Injectors..
> > Idle Stabilizer Module..
> >
> > I know that I need to adjust the throttle body micro switch. I've just
> been
> > lazy..
> >
> > Anything else I should be looking at before I throw money at it?
>