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Old 05-27-2013, 04:09 PM   #5
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Join Date: Nov 2002
Location: Beautiful BC

If it's a CBV venting to atmosphere, it will be open during cruising, sucking in unmetered air, unless the diaphragm pre-load is set high enough (if that model is adjustable).

Can you verify you are getting 10psi in the intake manifold, not pre-throttle body?
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