Check the spark plugs, see if they're ok. If they're blackened up, clean them with a wire brush unless they're iridium tip spark plugs (they have a very tiny tip for an electrode). If they're fouled with oil, replace them and i'd also reccomend a valve cover gasket replacement. Give it a good oil change too, that should be done every 3000 miles, or 5000 if you use synthetic. If you use synthetic, don't switch to conventional oil otherwise you'll get engine problems. Give it a transmission fluid and filter replacement. You don't need to flush it unless either it's really bad or if you have access to the equipment to do it. Check the dipstick to see if it's bad. Check the coolant at the radiator cap. Stick your finger in and rub it around the neck. If you get either gunk or any grit, then take it in for a coolant flush. Also check the quality of your brake fluid. If it's black, then get the brakes bled, and while you're at it check the brake pads. If the braking material is thinner than the metal backing plate, then replace the brakes. If they need replacing, feel your rotor for any grooves/unevenness. If there are any defects, replace the rotors. If you really want, you can check the suspension components if you can get the wheels off the ground. Just grab ahold of the part and give it a good shake, if it feels loose, then replace it.