Rattling like metal in tin can ?

What is your question?

So i bought the car used and ever since i have heard a sound coming from under the car and or engine bay that sounds like you put a piece of metal in a tin can and shook it around. It happens when accelerating but normally only when accelerating quickly or past 2500 rpm

What makes this problem better or worse?

Not being driven for a few days makes it worse

How long has your 1995 Mazda 626 had this problem?

Since bought about a month ago