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#18 is the switch I was talking about.
I would disconnect at 22 then plug both the intake and the hose to the SAI. Then run the car and see if it changes anything. (misfires) that way you take the vacuum portion of the SAI out of the equation.
If no change then the SAI vacuum system is good and the problem lies some where else.
If it fixes the misfires then the problem is in the SAI system.
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