DTC P1129: Manifold Absolute Pressure Sensor Signal Higher Than Expected

Start engine and run at 3000 RPM, with no load (in park or neutral) until radiator fan comes on. Allow engine to idle. Using scan tool, check MAP sensor data. If MAP sensor reading is 43.3 kPa or less, problem is intermittent. System is okay at this time. If MAP is not as specified, replace MAP sensor.