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Open the nhood, lift the engine cover and expose the intake. In the center of it is a valve with a vacuum line feed to it. Shutdown the car and see if it is coming from that valve. Mine did yesterday very pronounced, but usually do not hear it in the car. This is a normal deal for this valve and it can be somewhat loud.
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1LT; Airaid CAI; Flowmaster American Thunder Axelback; Int Floor Lts; RS Spoiler; Radio Controls; Sequential tail lights; Oil Catch Can; VMAX Throttle Body; MACE plenum spacer; Mace manifold insulator[/I]  |