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  1. High pitched noise after replacing upper plenum gasket

    1st Gen Hangout
    I have a 2004 Nissan Frontier 4X4, original owner, 240,00 miles, and running very good. In order to replace the valve cover gaskets I had to remove the upper plenum. I used a Fel-Pro gasket for the plenum. After completing everything I noticed a high pitched (almost electronic) whine coming...
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