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Hello- > Neither of these should have any effect at idle, so I find myself wondering if > your butterfly valve isn't closing all the way, right away. I also wonder if the retard diaphragm is cracked and leaking. This is the #1 most common failure for dual-vacuum canisters, and since the retard portion gets its pickup from below the throttle plate, would cause a problem with idle. Take care, Shad Laws LN Engineering - Aircooled Precision Performance http://www.lnengineering.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org