4.7L V-8

Fig 1: Identifying Manifold Absolute Pressure Sensor (4.7L V-8)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

The MAP sensor (3) is located on the front of the intake manifold. An O-ring seals the sensor to the intake manifold. 

1. Disconnect electrical connector at sensor.
2. Clean area around MAP sensor.
3. Remove two sensor mounting bolts (2).
4. Remove MAP sensor from intake manifold.
5. Check condition of sensor O-ring.