I would strongly suggest a UIM/LIM/TB cleaning. Also consider a new Fuel Filter and some Injector cleaner.
You can take everything apart and flush/clean the manifolds manually, or use the "Big Jim" method. Either way you will restore maybe 5-10 HP and pick up a few MPG.
My mileage jumped 3-4 MPG after the cleaning (22-24 average now, in mixed driving, about 260-280 miles per 11-12 gallon fillup)
If you're not sure what I'm talking about go to the main page and read the how-to on cleaning the intake manifolds. (In the FAQ section)
