See what direction the fault codes point you in. Post them here and we’ll be happy to assist.
Also post photos of the plugs. There’s a lot that can be seen in their condition. There’s clues in them there plugs. Here’s a link to some charts to help determine what the clues mean.
http://www.bing.com/images/search?q=reading+spark+plug+chart&qpvt=reading+spark+plug+chart&qpvt=reading+spark+plug+chart&qpvt=reading+spark+plug+chart&FORM=IGRE