mine does that as a result of a broken motor mount. i believe they are filled with oil on the pre-98's. i was pulling mine out and it broke in my hand. so i put it back in till my new ones come, but it only squeaks on turns and rough roads.
95 GL MTX Zetec, Carbon Fiber hood:
*neoprene seat covers
*new SVT rear bumper

*Proud Owner of 1962 Chevy Corvette 427