The throttle position (TP) sensor is used by the powertrain control module (PCM) to determine
the throttle plate angle for various engine management systems. The TP sensor is a
potentiometer type sensor with 3 circuits.


The PCM provides the TP sensor with a 5-volt reference circuit and a low reference circuit.
Rotation of the TP sensor rotor from the closed throttle position to the wide open throttle (WOT)
position provides the PCM with a signal voltage from less than 1.0 volt to greater than 4.0 volts
through the TP sensor signal circuit. If the PCM detects an excessively low signal voltage, this
diagnostic trouble code (DTC) will set.
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Throttle Position Sensor Description
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Question: Intermittent high idle and overheating 2001 Pontiac Montana.

Answer: Is the overheating also intermittent?

A little more consistent but not as hot until idle.

Overheating can be caused by low coolant level, stuck thermostat, or even a blown headgasket. High idle is usually a vacuum leak, but will
always be a high idle. If that comes and goes, you may have a throttle position sensor acting up. I would suggest getting the computer
codes scanned.

If i filled coolant do i need to bleed air?

Yes.

If its headgasket how would i know?

Coolant would leak out the engine or leak internally. Removing spark plugs to look for coolant in the cylinders would confirm the latter. Also
it would blow white smoke.

Great, thanks.