A rattle that is engine-speed related is probably the release(throw-out) bearing in the clutch. I have seen several Focus owners on www.club-focus.net complaining that their cars sound like a tractor at low revs because of noise from that bearing.

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'98.5 Mystique GS ATX/re-contented door lights/K&N Filter/Energy Suspension Sway Bar Bushings/Mintex Street Pads/high-beam bulbs in low-beams/Pioneer DEH-P3100 receiver/Pioneer TS-A6855's in all doors


Justin
'02 Ranger Edge ext cab
Retired: 98.5 Mystique