I have a rattling noise from my engine whenever i let off the gas. For example, when i shit from 1st to 2nd, and i let off the gas for that second and my engine rpm drops, i get a rattling noise. Another example would be if im in 4th gear, and i shit into neutral, when the engine hits about 1000 or 1500 rpm, i get a rattling noise. It might not even be the engine Any ideas wat this could be????