I thought that at WOT there was virtually no vacuum at the spark port? When I crack the throttle open from idle with the vacuum guage hooked to it it stays at 0, if I hold the engine at say, 2000 rpm, it settles to about 20" and back at zero at idle. Also everything I've read says the same thing, I think you've just mixed yourself up today PKRWUD, everthing else you've said makes sense to me except this.
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