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Reminds me of my AOS failure. I was convinced I had some pulley or belt noise that would make a squeak squeak noise as the car warmed up and would get worse. It would go away under throttle and come back when coasting or idling. Got to the point one day where it didn't stop even at idle. Turning the a/c on actually made the sound go away at first because of a slight increase in RPM I think.
Check the vacuum on the oil fill cap after the car is running just to see if it could be that. My noise was caused by the vacuum from the AOS failure sucking air through the crank case seal. I couldn't remove my oil cap after I unscrewed it with the car running. Replaced the AOS and it was fine.
Most people that describe the noise you are referring to also mention that it comes from the gas cap or wheel well area. Could be a purge valve from the charcoal canister or a wind noise from the area if it happens at speed.
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