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I also have an 08 beetle that at idle surges and trust to die. Can't figure it out. I have replaced the valve cover gasket and rebuilt the vaccum pump. Any help would be great thank you
 

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I assume, you have the 2.5L engine; the PCV diaphragm, is a common failure and we have also seen, a vacuum leak, from a cracked plastic hose/pipe, from the brake booster.


Using a scan tool, check your live data and see, what the fuel trims are, that can confirm, a fuel delivery or vacuum leak issue.


Please, post any trouble codes; that you are currently getting. Thanks.
 
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