1998 Mercury Mystique Idle will very up and down causing st

1998 MERCURY MYSTIQUE
147,000 MILES • 6 CYL • FWD • AUTOMATIC
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PAULDH
  • MEMBER
  • 1 POST
Car shows check engine light I had it checked and it shows only oxyegen sensor problem.I have not seen an oxyegen sensor cause this kind of problem.I am thinking throttle position sensor.what are your thoughts on this. Also once the car warms up the idle will smooth out. Thank you for time.
Feb 17, 2010 at 3:28 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Try cleaning out the idle air control valve and test the TPS and MAF sensor-could also be the O2 sensor sluggish
Feb 17, 2010 at 3:35 PM
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