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My 2000 3.9 Dak was running crappy so I replaced the PCV and grommet. Didn’t help. When I disconnect the hose from the air hat with the pcv left in and drive it, it runs great. Can I just disconnect and go?
 

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If you are talking about the plastic elbow on the passenger side...that's not the PCV valve. It's on the drivers side valve cover with the hose going to the intake manifold. The rubber hose may be stopped up as well as the nipple on the manifold. Using a 5/16" metal bit with a pair of pliers, carefully turn the bit back and forth inside the nipple until it's cleared of the carbon buildup.
 
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