Car makes high pitch whining noise as soon as I hit 20mph+, what could it be?

MeganH

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I drive a 2004 Porsche Boxter with 35K miles on it.

It makes this high pitch whining noise as soon as i hit 20mph give or take. but once I'm down into 1st gear or under 20mph it goes away? It's not consistent either. It comes and goes, I went for 2 months without hearing it, then the past 3 days it's been off and on again.

I want to get it checked out by my mechanic, but I don't even know what to tell him to look for, b/c it's not consistent. So if I take it in and it's not making the noise, I'm not sure what to tell him the problem is! any ideas?
 
Try a new air filter and put some fuel injection cleaner in the gas.
 
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