I'm assuming mine is a leak I checked around the intake and mass don't see anything, sprayed carb cleaner & waited to see if revs went up and no luck. However I just got the vehicle and noticed oil leak from the valve cover gasket in the back that drips on the exhaust manifold assuming from a smell I get once in a while, I'm not sure if I'm getting a air leak from there since they said the bolts on the valve cover are plastic material and tend to break from the heat of the motor.
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