Dr. J: Let us know if the Subaru throws a CEL.
You should be able to create a fake IACV for the computer to look at. If you don't want to spend a bunch of time at RadioShack, then you could just zip-tie a junkyard IACV next to your throttle body and plug in to that for the summer.
Or perhaps you could create a restriction in the IACV air passage. Be careful that your restriction doesn't get sucked into the engine; the pressure across a throttle plate is enormous.
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