Drive 6 miles and parked for 30 minutes, then would not start. After about 45minutes, engine started and drive home with no trouble. After 1 hour tried to start, could not keep running at idle.Could get about 20 seconds of running if gas pedal is held down about an inch,then dies.Computer codes read are P0108,P0038,P0032,P0508,P0406,P0204. Have replaced Idle Air Control motor with junk yard one, Replaced the Manifold Absolute Pressure Sensor with 2 from junk yard. tested,as best I could the voltages etc of the MAPS, Idle Air Control and EGR Valve, all are within spec. Last resort replaced ECM/PCM with certified rebuilt. Cleaned Throttle Body well.

Still get P0508 and P0108 codes Engine will not start and maintain idle speed.
Any suggestions appreciated.