If you're confident in your own skills with a Dremel tool, you can do it yourself like I did for my friend. I was going to use it on my own jeep, but the gas mileage suffered a little. Since it's my DD I decided to give it up.
Remove all the sensors and the throttle plate. then make a straight line accross the throttle return spring to help line it up later. Carefully clean the throttle shaft so that when you remove it you don't nick the sealsat each end. Get a new gasket and center it on the bottom of the TB. Use a sharpie marker to shade in the aluminum you need to remove, and draw a line around the throttle bore just above the area where it tapers below the blade. Take it easy and be very paitent while you hack away the metal until you have it nice and evenly rounded from the top line to the outer edge of the shaded area. Using a cylinder hone on your electric drill, hone the entire bore from top to bottom very lightly. Then use a little metal polish and a rag to clean it up nice and bright. Reassemble the throttle shaft first using the line on your spring to ensure the correct spring load. Then just put the rest back on and bolt it back on your intake with the new gasket.
It sounds easy, but it's actually a lot of precise work. I should probably mention I did it to a spare that I got from a junk motor at work.
