have 2001 ford taurus eng came i scanned it came up as missfire cylinder 1 changed plugs wires ing module twice what else would cause this problem

 

What engine do you have in it?
Check the coil pack for any cracks at the terminal posts.
A possible vacuum leak at the cylinder giving the misfire reading.
Sometimes the PCM will give the wrong cylinder misfire number.
If you can't find anything definite consider swapping the injector with another cyl and see if the misfire moves.
Is the misfire steady and regular, if so check under the valve cover on the rear bank where #1 cyl is located , look for anything unusual, valve spring, rocker barely moving etc.
Instead of moving injectors disconnect the injector plug and check for battery voltage on usually the red wire and then see if the PCM is grounding the other wire to the injector for it to operate. If OK, swap injectors.