did the rattling sound like pennies rattling in a tin can? i had a 90' delta (well i still do it just sits dying in my driveway)but i had a noise from around the front right wheel...it sounded like pennies in a tin can. my car also kinda shook and it also would kind of loose steering...(my dad drove it once and thought he was gonna die) but anyways i was told it was the waterpump or the power steering bearings from the the pulley on the driveshaft. what i would do is get a lenth of hose, put it up to your ear, and run the other end all along the serpentine belt (if you have long hair i wouldnt recomend using to short of a hose) and the pulley where the noise is the loudest...chances are its that one. good luck.