If so, I need your help in analyzing the idle stabilization units of
the various engines, especially the 2.1L.
Take a look at this thread I've started:
http://gerry.vanagon.com/cgi-bin/wa.exe?A2=ind0709A&L=vanagon&P=R2251&D=0&H=0&O=T&T=1

And also at the article:
http://www.vanagonwiki.net/index.php/Second_type_of_idle_control_system

And it's parent:
http://www.vanagonwiki.net/index.php/Idle_Stabilization_System

It's exteremely hard to debug a defective circuit (for the benefit of
other vanagonauts too) without a schematic diagram or working sample.
So if anyone has one and is willing to help, I'll be glad to liisten...
cheers,
TM