quetion about a computer code

i just picked up a 99 crown vic interceptor and it is throwing the code po353 and the number 3 cylinder is misfiring and i just wanted to know if anyone else has had the problem just to give me a place to start looking i know it has to do with the signal from the computer to the coil which might mean bad computer and if so does anyone know what year computers work with each onther and where to get one