First, welcome aboard.

Second, you'll have to be a little more specific if you want reasonable chance of assistance. What engine do you have? If noise occurs at idle, open hood and determine the general area of engine it seems to be coming from (front, back, etc.).
V6 prone to have resonating "moose" noise from air intake that will vary in pitch if you squeeze big accordian hose.


98 Mystique LS v6 atx 110,000km
97 Contour LX v6 atx 125,000km
stock CD on LS, cass on LX
spoiler, tinted windows on LS only
4 wheel discs on LX only
All other available options on both