Under the rear of the car, right behind the gas tank. You'll need the a fuel line removal tool to unplug the fuel lines when you change it out. AutoZone has a plastic version of the tool that works fine, and its cheap money
It's back by the gas tank...jack up the car and you'll see this canister looking thing with 2 fuel lines going into each side...I think on the 98's you'll need to have a fuel line removal tool, which you can get at autozone for like $4-5...