If it is a boost leak, ether's only going to cause a bump in the idle if the leak is so bad that it's already affecting the idle... A boost leak can be crap to track as it doesn't actually leak until there's a good amount of pressure. Google "DIY boost leak tester" or something along those lines and you'll find instructions on building a simple test kit.
If you suspect your intake piping then check it. A leak AFTER the air flow meter is what will cause your issues, not one before it... although fuel cut at only 5psi is most likely after the turbo.
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