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2001 Kia Rio

Question: what is it?

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nomorenames, 1.5L 4 Cylinder, Great Falls, MT, September 08, 2010, 07:36

 Rookie

my car while idling it runs fine but when its under load it loops or bucks when in drive.it revs up fine to, only when under load does it do it.

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• Answer #1

  Oakman September 08, 2010, 19:47
  

   Master

  It sounds like and engine misfire under load to me. Possibly ignition coil, spark plug, or plug wires if equipped. An engine misfire on your 2001 Kia Rio should turn the check engine light on as set a fault code which may let you know which cylinder is misfiring. You will need a code reader or scan tool to access any stored fault codes.
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