autogasman

Hi I have problems with the map sensor readings incorrect causing drivablilty problems. Car is a holden vx commodore ls1, mafless tune. The map sensor reading with key on engine off is 60 kpa approx 2.3volts, however the voltage coming out of the map sensor is 4.85v at the sensor and pcm. Have checked the map scaling in hp tuners and seems right 94kpa I suspect a pcm fault ??