2000 3.3L Spark PLug problem

I just changed the plugs in my 2000 G.Caravan today, which like everyone said is a unbelievable pain. After I was finished I started up the van and it idles rough and drives rough and feels underpowered, I gapped all the plugs correctly and the plug wires all go to the right plugs. Any ideas??

If you didn't change the wires too it is very easy to break them trying to yank them off , you might want to change the wires too .