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Personally I have always cleaned the iacv mating surfaces really good and used a tiny bead of rtv to seal it. I prefer grey rtv to gaskets most of the time.
Boost leak testers can be somewhat difficult to detect IM leaks. Also before anyone suggests the propane method for the intake manifold leak it really isnt going to work either because of how the ecu deals with the problem it already knows it is having.
First thing would be to just inspect the TB. If the problem cannot be resolved there take off the IM and inspect it and tear it down and put it back together.
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