i'm no expert but i would look at cv joints or at least start there. look for any tears or openings in the rubber boots . also look for play in any bushings , bearings , ball joints ect . last week i replaced the rack and pinion ,in my 2000 continental . i also changed the tie rod ends , there were not bad but they did have some wear so i figured do it , i dont think i would do that job my self again . very little room to work, i think they greased the engine well and used a shoe horn to fit all that stuff under the hood . good luck