As mentioned you should definitely check the cylinder head temp sensor.  It
is screwed into the head near the injector on the number 3 cylinder and has
a single wire running out of it.  You can use an ohm meter to test the
sensor at cold and hot or you can also test it somewhat by either unplugging
it or grounding the wire (can't remember unfortunately) while the engine is
hot to see if it runs better.

Either way it's a cheap item to replace and what you describe are classic
symptoms for a failing cht sender/sensor.

Jonathan Poole
'83 AC Westy

On Fri, Feb 4, 2011 at 11:24 AM, Tabe Johnson
<greentabe-vanagon@yahoo.com> wrote:
> I got an email from a vanagon guy in trouble so I'm going to take a look =
as soon as I can reach him. =A0As I recall the FI is more or less the same =
in all the air cooled models, but I haven't touched an air cooled in many m=
oons.
>
> Summary: =A0Starts fine cold, runs poorly when warm. =A0Without looking a=
t it, it sounds like it's running rich when warm. =A0I'm thinking cold star=
t valve? =A0temperature sensor?
>
> Thanks for ideas.
>
> tabe johnson/90MV