ck eng light came on -code reads misfire on 2 and 4. what do i do to fix that

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we have ck'd the plugs and the coil moving them around the only time it ran rough was when we removing them, checked EGR Valve it was clean not sign of clogging or dirt. I dont know what to do next I'm on a fixed income and need someone to be fair. What else should i look for or where can i go to get it fixed for a fair price.