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

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?

by in Parksley, VA on February 01, 2014
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2 answers
ANSWER by , February 01, 2014
Reset computer and drive it 3 miles..
ANSWER by , February 01, 2014
Vacuum leaks are common on this engine! That will cause the rolling or fluctuating idle.