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    Noise Under the Valve Cover Please Help!!

    My daughter's 1992 2.3 L 4 cylinder mustang has a noise which seems to be coming from under the valve cover. When it's idliing it sounds like a rat-tat-tat rattle. When you rev the motor, you don't hear the noise while the motor is speeding up, but when the motor is slowing down it makes a loud...