I presume you have replaced the spark plugs and coil pack, as these are the most common items to fail and cause a misfire.
However, if you have already done this and still have a misfire, does it happen more when the engine gets warm? If so I'd suspect leaking core plugs in the cylinder head. There are two. When they leak they project a fine spray of water mist over the spark plugs and cause a misfire. The cure is replacement with new core plugs. Take the old ones out, clean up the threads, and screw in the new core plugs using the correct sealant. Good luck!
ChicksFan
February 2015