DTC P1129: Manifold Absolute Pressure Higher Than Expected

Start engine and run at 3000 RPM with no load and transmission in Park or Neutral, until radiator fan comes on. Allow engine to idle. Using scan tool, check Manifold Absolute Pressure (MAP) data. If MAP is 12.8 in. Hg or less, problem is intermittent. System is okay at this time. If MAP is not as specified, replace MAP sensor.