Mitsubishi Mirage hesitation?

2001 MITSUBISHI MIRAGE
155,000 MILES • 4 CYL • AUTOMATIC
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ATKURIEN
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Mitsubishi Mirage hesitation?
Hi guys! I've got a Mitsubishi Mirage 2001 with a 1.8L engine.
When accelerating, the car hesitates and seems to fire on 3 cylinders. The car runs smoothly if the acceleration pedal is not push down.

The spark plugs seem to be black(a sign of rich fuel and cold firing). This may be a clue to the first part of my problem.

Please let me know if you experienced this problem and what you did to solve it.
Thanks!
May 9, 2011 at 10:13 PM
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ATKURIEN
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Yes, the check engine lights has been on since day one.(Goofy me)

I will take it to the local auto store which they will tell me the code and that would be a great clue on which of the above problems could apply.

Thanks for the wonderfully quick response!
May 10, 2011 at 12:31 AM