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It looks like you have a leak when vacuum is high, which is what happens with leaking BOVs. Actually they all leak at idle, the vacuum pulls it open and unmetered air goes through the system.
There 2 fixes for that:
1/remove it
2/recirc it
The third option is to deal with it and hope it will never suck enough dust to damage your engine (hope is not something you should count on with engines IMHO but to each their own)
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