Sounds like an O2 sensor issue. To confirm, when it happens, hold throttle
steady and turn ignition off and back on. If it works ok for a short while,
then definitely O2 sensor or wiring for it.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Shawn Fowler
Sent: Wednesday, February 28, 2007 10:15 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Diagnostic Question

Howdy,
 I  just picked up an 87 2wd Westfalia- the plugs, wires, cap, rotor and all
fluids  are new. I also replaced the ground on the O2 sensor. I have put two
tanks of  gas through it, one with fuel injector additive. Anyhow, the van
runs well most  of the time but intermittently starts missing on what I
think are two cylinders.  This happens when I am holding the gas steady and
stops happening if I floor the  gas pedal rather abruptly. A few seconds
after I take the pedal off the floor,  it starts missing again.
 Does  anyone else recognize these symptoms and have any  suggestions?
 Thanks
 Shawn
 Portland  Oregon

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