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From the EBSCO manual for your car:
"Throttle Position Sensor
Operation
The Throttle Position Sensor (TPS) is the only sensor in the Engine Management System (EMS) that the vehicle operator has direct control over. The sensor is a potentiometer providing an analog signal to the computer. This signal represents how far the throttle plates have opened.
The Engine Management System calculates how much air should have entered the engine and compares this value with the Manifold Absolute Pressure (MAP) sensor or Mass Air Flow (MAF) sensor value. The EMS uses this information to calculate fuel delivery and ignition timing requirements.
The EMS on vehicles equipped with an electronic transmission utilize TPS sensor in combination with MAP and MAF sensor values to determine shift schedules and torque converter clutch application.
Some vehicles will also incorporate a throttle switch. The throttle switch is used to notify the EMS when the throttle is either at wide open or at idle.
A faulty throttle position sensor or switch due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit can cause the following symptoms.
Related Symptoms
Bucking
Hesitation
Stumble
Chuggle
Stalling on Acceleration"
I would pull the TPS and test it with an analog ohm meter. It is easier to see needle swings rather than numbers on a digital one. It should be smooth changes in resistance as you move the input to the TPS.
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