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What is causing a misfire on #4 even after new spark plugs and new coil?

(2003 Jeep Liberty)
in Fort Worth, TX on June 23, 2012
engine light came on when i turned a/c on. After coil on #4 was changed, and the code reset, it seemed to have fixed the rough idle. I turned the a/c on while driving, the car jerked a little and the engine light came back on. And it still reads misfire on #4
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