That's interesting. Rather than a throttle set screw, they would use an aux air bypass. This is common on new FI setups where the valve is a solenoid run by the fuel inj controller. The bypass should be tested as fully closed. I can now see how the casting has the bypass around the throttle plate. Air must be getting through there and feeding the engine.
I would still suggest doing the vac leak tests, but also figure out how to close that bypass valve.
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