1996 Ford Taurus 96 Taurus 3.0 6 cylender problem

IDLE SPEED
Idle Air Control (IAC) Valve Assembly
IAC valve assembly is used to control idle speed and provide a dashpot function. IAC valve assembly meters inlet air around the throttle plate through a by-pass within the IAC valve assembly and throttle body. See Fig. 6 .
The PCM determines desired idle speed or air by-pass and signals the IAC valve assembly through specified duty cycle. The IAC solenoid is built into IAC valve assembly. IAC solenoid responds by positioning the IAC valve to control amount of air by-passed. PCM monitors engine speed and adjusts IAC duty cycle to achieve desired RPM.
Fig. 6: Cross-Sectional View Of IAC Valve Assembly Components
Courtesy of FORD MOTOR CO.

Throttle Position (TP) Sensor
TP sensor is a rotary potentiometer. TP sensor monitors throttle plate opening. Its signal to the PCM is proportional to throttle plate opening angle and rate of angle change. The TP sensor signal affects air/fuel ratio, injector timing, idle speed, EGR flow and ignition timing. The TP sensor is mounted on throttle body, at throttle plate rod.

Mass Airflow (MAF) Sensor
MAF sensor uses a hot wire sensing element to measure amount of air entering the engine. Air passing over the hot wire causes it to cool. The hot wire is maintained at 392 °F (200 °C) above ambient temperature, as measure by a constant cold wire.
The current required to maintain hot wire operating temperature is proportional to the intake air mass. The PCM calculates the fuel injector pulse width in order to provide the desired air/fuel ratio.