In addition to plugs & T.Body cleaning, may want to remove & clean your upper intake and clean your lower intake/ secondaries in place. They can get pretty gunked up from the EGR crap. While doing that, check to see that your intake manifolds are "port matched", it has been mentioned that this can be off a little. Consider fuel flow as well, injector cleaning and new fuel filter. Make sure your air filter is clean. Just a bit of TLC & youll be back in business.
