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Two days ago my car had a couple of misfires. Checked it and the code was P0303. on 2004 Ford Taurus

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After getting code it said it misfired on 3rd cylinder. But while I drove home the day that this happened, the engine light came on, that's how I got the code. I had new motorcraft plugs and wires installed. Now the car is idling too fast, then drops down and goes up too high again. Can anyone help me?
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