I have a 2001 mustang gt. the motor has 30000 on it. One day i went on break to start my car up and all of a sudden it started to clatter almost like a lifter. Its worse when you barely touch the gas. Some people told me it was a rod bearing but its not a knock its a clattering sound and im still driving this car after 3 weeks now and its not getting any worse. A ford guy told me he thought it was a scorged piston any help would be great