What can I do to pin point exactly why I'm getting the p0172 and 0175 codes?

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Experiencing Rough Idle like the car wants to stall out and sometimes does. Lack of power when accelerating RPM's while Idling fluctuate between 800-1100 rpm . Fixes I have already done include New MAF Sensor, New Air Filter, New PCV Valve and hose, Motocraft Spark Plugs and Wires, New thermostat and Engine coolant sensor.