I have a 2007 Sport automatic with 116,000....I have a missing and Studdering problem. I have replaced one coil pack a month ago and now the code reader is saying miss on three out of four cylinders. Is this typical for the others to go out? I am running fairly new spark plugs too. Just from what i have read and the scanner has told me it is not fuel related but i am still not sure? Also where is the trans filter? Last thing there is only a fuel filter in the tank correct?

Please help

Thanks,