I think you're on the right track with the AFM.
Temp sensors might need attention too.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Blake Sartin
Sent: Sunday, November 02, 2014 8:25 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Still trying to diagnose an off idle stumble.

I have cleaned contacts in the distributor cap, set timing, even tried
advancing it a bit. I have replaced the malfunctioning vacuum advance. The
two relays are new. Idle stab is doing its thing. No terrible vacuum leaks.
I also tried unhooking the o2 sensor. My next step is trying to locate
someone with a working afm to try, unless anyone out there has any better
plans.

Vanagon off idle stumble: http://youtu.be/Eeo_vfue-q0

Thank you for your continued help. The van is pretty near undriveable in
this condition.

Blake Sartin
Maryville TN
84 Vanagon