Ford Repair Questions? Ask a Mechanic for Answers ASAP
Thanks for using Just Answer, the most common cause of the problem you are having is a leaking valve cover gasket, causing oil to leak down in the hole`, therefore causing a misfire, I am sending you instructions on how to replace in pdf format, hope this helps you out.
CLICK HERE FOR INSTRUCTIONS
If the plugs are fouled up with oil then the likely cause will be worn or defective piston rings, see below.