no wires on a 2000...no cap, no rotor, just plugs. That's it for a basic tune up.
Now if you want to do your Jeep a favor, change the oil and filter, air filter, lube the steering linkage, ball joints, driveshaft, change all wiper blades, drain and refill Transfercase fluid, drain and refill tranny if automatic, check axle fluid levels, check air pressure of all 5 of your tires, inspect brakelines, cylinders, pads, rotors, drums, shoes, adjust rear brakes if drum type, lube all door, hatch, and hood hinges/cables, inspect all u-joints, inspect exhaust sytem, rotate tires, wash and wax jeep, and then polish the flux capacitor brackets.
probably forgot a lot of stuff, but somebody will spot it...