The give away here is the brief period of normal running after re-start.
Definite O2 sensor or wiring problem. Bad ground, shorted O2 senor lead,
etc. Bad temp sensor would effect the starting or the richness would be
immediate.

Dennis

>From: John Bange <jbange@GMAIL.COM>
>Reply-To: John Bange <jbange@GMAIL.COM>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: '89 vanagon poor engine performance
>Date: Mon, 2 Apr 2007 22:17:30 -0700
>
>On 4/2/07, danielludwick <danielludwick@gmail.com> wrote:
>>
>>  Now I've put a knew one and and wired it in, but give the engine 2
>>minutes and I find that at low RPM's the engine seems to be getting too
>>much
>>fuel (or perhaps not enough air?); it boggs out and nearly dies. If I turn
>>off the engine and restart it, the problem goes away for a few minutes, I
>>would assume because it takes the computer about this long to register the
>>info it receives.
>
>
>If you're confident the O2 sensor (and associated wiring) is OK, then it
>sounds like a possible Temp II  (water temp)  sensor problem.
>
>--
>John Bange
>'90 Vanagon - "Geldsauger"