DTC P1128: Manifold Absolute Pressure Sensor Signal Lower Than Expected
WARNING: This page is about a different car, the 2003 Acura 3.2TL and 2003 Acura 3.2CL. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition switch on. Using scan tool, check MAP sensor data. If MAP reading is 54.1 kPa or more, problem is intermittent. System is okay at this time. If MAP sensor reading is not as specified, replace MAP sensor.