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Engine Performance problem
1999 Mercury Tracer 4 cyl Two Wheel Drive Automatic 144123 miles
WHEN I STARE THE CAR . I HEAR A KNOCKING ON THE LEFT OR RIGHT SIDE OF THE ENGINE AND SOME TIME SEEN LIKE THE SOUND COMING FROM THE MUFLER ON THE MIDLE PART. SOON I PUT IT ON DRIVE THE SOUND GOES AWAY. AND DON'T SOUND ANY MORE .WHAT COULD THAT BE THE PROBLEM?
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