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Temp II and the Throttle switch are common idle problems.
Look @ this Dogpilot post

http://www.thesamba.com/vw/forum/viewtopic.php?t=292275

> 1. '88 Vanagon poor idle when engine is first started (4)

> On 4/23/2014 2:58 PM, John Graham wrote:
>> I have an '88 Vanagon totally stock 2.1 engine that has served me
>> well for the past 203,000 miles.  Most recent engine repair was
>> to refurbish the heads about 10,000 miles ago and had been
>> running fine since.
>>
>> My recent problem that started this winter is a poor idle
>> condition when started first thing (i.e. engine is at ambient
>> temp).  The engine starts fine, with idle a little over 1K and
>> idles there for about 20 seconds and then want to die unless I
>> give it some throttle.  If I let it die, it restarts just fine
>> and runs for the 20 seconds and dies.
>>
>> I can drive off at this point without problems because the RPMs
>> are up.  My first stoplight is about a half mile from my house
>> and by the time I reach that point, the engine will idle - though
>> a little roughly at about 900 RPMs and by the time I've gone say
>> another mile, it has pretty much settled down to a normal idle
>> when stopped at a light.
>>
>> If I make a quick stop at a store after the engine is warmed up,
>>  it restarts with no startup idle issues.
>>
>> So - I suspect something related to a 'cold idle' system.  I've
>> recently changed sparkplugs and airfilter and rotor and cap have
>>  less than 5000 miles; Ignition wires are about a year old.
>>
>> I'm open to suggestion for what to try next.  I'm fairly handy
>> and of course have a Bentley manual.

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