If you have a large vacuum leak (like, say, the PCV), it could cause severe idle stability problems. Replace that stuff that you've already identified, reset the engine control computer, and see if the problem is fixed.
1999 Contour SE Sport MTX75 T-Red/Grey
Audio: Pioneer DEH-7400MP (MP3 CD), Pioneer TS-A6857 front & rear, PPI PCX-250, Infinity Perfect 10.1
Other: cup holders, cargo net, Blizzaks, Potenza RE950s
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