For 1990-2009 cars

1. Remove the throttle body nuts (503).
2. Remove the throttle body (502) and gasket (501).
3. Discard the gasket.
4. Remove the throttle body studs (504), if required.
5. Remove the manifold absolute pressure (MAP) sensor bolt and MAP sensor.
6. Inspect the MAP sensor seal for damage.
7. Remove the evaporative emission (EVAP) tube.
8. Remove the EVAP purge valve and bolt.
9. Inspect the O-ring seal for damage. Replace as needed.