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Originally Posted by Larry Delor
Did these symptoms just start out of the blue, or was it a gradual degeneration in performance?
How did the plugs look when he pulled them?
What made him think that one O2 sensor was bad?
Are you using the correct grade of fuel/using a quality fuel?
You say it idles rough...what about when you accellerate/drive at a steady speed?
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The check engine light came on a couple of weeks ago, till then the car was running fine. The O2 sensor was changed a little over a year ago when the CEL light had come on then. I have only used premium fuel in the car. The car runs fine at a steady speed but occassionally I can feel it "skip a beat" (probably when one of the cylinder misfires!)