Cranking with the throttle body on initially produces the same vacuum until the butterfly starts to open which is when vacuum is lost never to return?
I understand that this is idle control possibly trying to bring idle speed up as this idles at around d 6-700 rpm but why does it not decrease opening degree of plate to increase manifold vacuum? ? 
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Citroen C4 NFU 2006 - Will not rev, No codes? # - Luke Browne March 3, 2016, 1:01 pm
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