My wife's new Grand AM GT is making an odd noise at idle. It sounds like the engine is speeding up and slowing down rythmically, although you can't see this on the tach. Reminds us of a cat purring.There is also a very quiet sort of whistling noise coming somewhere from up front. We naturally intend to take the car to the dealer, but does anyone have any ideas what this might be? Thanks PS-- otherwise an awesome car!
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