I would say about 500 RPM.
I just checked my timing a couple of days ago and I feel it was about 2
degrees off ( or so ).   When I corrected it I saw about that much change.

John Mclean   87  Vanagon  GL

> again messing with me.>
> Questions:  How much of a change in idle RPM can I expect from a two
degree
> change in advance?  Any thoughts on what might be causing my throttle
> control valves to fail after working initially?  I've got another one I
> might try tonight.
>
> Thanks again.
>
> Jeff Warner
> Galloway, OH
> '87 GL Weekender "Van"
> '86 Wolfsburg Westy Weekender "Barry"
> CI 94 (including compressors!)
>