The TPS is as Neil puts it. Your engine I believe is CFI not multipoint. That
will mean you have a Idle Speed Control motor with an Idle Tracking switch on
the end of the motor push rod.. The job of the Idle Tracking Switch is to tell
the processor that the Idle Speed motor push rod has made contact with the
throttle linkage. When the switch goes bad the processor can not tell if the
motor has made contact so it will "hunt" the idle will go up and down repeatedly
and sometimes the engine will stall. The reason is that the primary value the
engine processor uses is the engine RPM, the TPS is read in ranges ( the
processor does not look at it in a linear fashion ).
I could be wrong but IIRC Ford built some of each in 1986, but 1987 models
all used multiport injection. That's referring to the Tempo. The 2.5 Taurus
used CFI and that stupid idle tracking switch for a couple more years I
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