NISSAN ALTIMA 76,000 MILES. EVREY MORNING WHEN I START ENGINEER, I HEAR SOME NOISE FROM ENGINEER. HOWVER, AFTER 1 OR 2 MINS, IT'S GONE. I WENT TO SHOPS SEVERAL TIMES, HOWEVER, AT THAT TIME, NO NOISE AT ALL BECAUSE I'LL DRIVED AT LEAST 5 MINS. PLZ HELP!

JIM