05 AMANTI RATTLING OR GROWLING SOUND IN RIGHT FRONT OF ENGINE WHEN STARTED COLD

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ONLY WHEN COLD AND THEN GOES AWAY AFTER ENGINE GETS WARM. OR IF YOU REVE IT IT UP A LITTLE IT GOES AWAY IT IS MOST NOTICABLE WHEN YOU DROP IT INTO GEAR. CHECKED HEAT SHEILDS OK AND MAKES SAME NOISE WITH AC ON OR OFF. DID CHANGE 1 IDLER PULLEY. STILL HAVE SAME NOISE HAD IT TO 2 SHOPED THEY CAN'T FIND IT EATHER NEED HELP.