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Was wondering if anyone could help me identify the source of it .It occurs when i am letting off the gas pedel around 2700 rpm to shift or just to coast.The noise sounds something like a vibrating heat sheild or something loose because it only last for a couple seconds as the rpms drop and goes away when i get back on the throttle.It seems to go away when the engine warms up after five miles or so.the car is a 78 with a 5 speed and 140,000 miles .The noise is pretty loud and makes me nervous that it could be something major so any help would be great thanks.