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This morning it sounded like I ran over some debris or something fell off. Next thing I know I'm hearing a whistle, almost like a jet engine. I took a quick look under the hood, but didn't notice anything unusual. I'll have to look up under the engine in the morning to take a closer look at the undercarriage.
I was having a similiar problem, changing the fuel filter helped it to run like new.
Replace your Serpentine belt would be my guess
Uphill, and when temp outside is cold seems to aggravate the condition