wittlewing

So here's my problem, my car slowly started misfiring 2 years ago and I lived with it for a litlte while, I got it checked out a bit, and I changed the plugs, did nothing, then I changed the wires and it was like new. Then a few weeks later it slowly started misfiring again, eventually, 3 weeks ago, I got new wires and it was like new again. But this last week, my car started misfiring again, any input appreciated. Thanks guys.

P.S. It's a 98 taurus