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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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Air pump? ...Is the frequency of the leak synchronized to the engine revs? --if not then air pump suspect
Listening to your engine video I would agree that you have a vacuum leak for one of the cylinders. But that last, shutdown video...
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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