My 85 Westfalia only bucks under exactly the same circumstances - high
humidity, up or down a grade, and resulting lousy mileage.  What does the
grade have to do with anything?

Jeff
85 Westfalia GL
Winnipeg (thankfully the flat dry prairie)

> I had the same problems with my 85 Westy.  Exactly the same problem.
>
> I took it to my all-knowing VW specialist.  He said that there are two
> things that could cause this.  First was the O2 sensor.  He disconnected
> it.  All was good for a couple days and then instead of bucking, it died
> going up hills on trips, especially while it was raining.  Of course it
> was a very thirsty little van as well.
>
>