DTC P1128: Manifold Absolute Pressure (Map) Lower Than Expected
WARNING: This page is about a different car, the 2000 Honda Civic. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition on. Using scan tool, check manifold absolute pressure. If indicated pressure is 16.0 in. Hg or more, problem is intermittent. System is okay at this time. If indicated pressure is less than specification, replace MAP sensor.