Check engine light is on. 145,000 miles (burns no oil or leaks.)

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scanner code is PO102. I replaced the MAP sensor with an AC-Delco part.Also checked wiring harness & connector(O.K) Light did not go off. Problem, car has a tendacy to hesitate at around 60 mph. Does not die & no MISFIRE.Transmission is O.K. At times, Car has a tendacy to stall at idle. Replaced the following: Spark Plugs & Wires (AC Delco) MAP Sensor(AC Delco) Mass Airflow Sensor(AC Delco) New Fuel Pump New Fuel Pressure Regulator New Fuel Filter New PVC Valve Oil change & filter Cleaned fuel injector plugs Cleaned Throttle body EGR Valve(AC Delco) Replaced coil packs(3) Replaced all vacuum lines & checked for vacuum leaks(O.K.)