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Block off the air shrouding vacuum hose from the thermo-switch to the intake. IIRC, the '05 should have this.

Having 20" of vacuum measured at the intake, isn't an accurate way to test for vacuum leaks. Is there ANY exhaust leaks just prior to the first air fuel sensor? It can draw in false air and skew its readings. Sometimes you may not hear the leak. You should use carb cleaner to check for vacuum leaks, not ether. Does it idle normally? A huge vacuum leak at idle should cause a very low idle on a MAF equipped car. What's the MAP voltage, cold start, and as it warms to operating temp?

Is the 45% positive trim at idle only? If you rev it to 2500, what's the short term and long term trims?
 
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