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Exhaust Manifold Issue?

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I have no idea what this is, but my car is making an annoying noise and not running as well as it should. Just had a mechanic take a look and he said it's most likely the exhaust manifold. What do you guys think?


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Administrator, Resident Tater Salad
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17,805 Posts
I think I hear hissing.

Pull off the spark plug cover and check for this. If that disc is hissing, you need to replace the valve cover, as it's causing a vacuum leak.


 
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