Whistling only at idle driving me nuts...help?

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Mojave_Z71

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Joined
Dec 17, 2017
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Location
California
Interesting info. Did it also only happen at idle like I am describing?

Yes, I could only really hear it at low rpm. Idle and maybe below 1000 rpm. Once I tried the wd-40 in the weep hole, the noise completely disappeared for a few days. It slowly came back, but at least I knew the culprit.
 
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