The Throttle Position sensor measures the throttle position, which is controlled by the gas pedal. It is used to determine engine load and if it fails it can cause automatic transmission shifting problems.
A failing throttle position sensor will cause idling problems when the car is warm. The failing sensor can also cause the car to stall when idling.
It is possible but not likely.
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Throttle Position Sensor (TPS) or Mass Air Meter
A bad throttle position sensor, on your 1991 Saturn, will cause the engine to run rough when it is idling. The engine will run normally at higher speeds.
Bad Throttle Position Sensor
If it is an 3.7L or 4.7L engine it is on the throttle body mounted on the side. If it is a hemi engine there are two throttle position sensors. The throttle body is electronic. There is a position sensor mounted underneath the battery hidden behind a cover. The accelerator cable goes from the gas pedal to this sensor. This sensor sends info to the PCM (powertrain control mondule). There is also another position sensor inside the electronic throttle body which tells the PCM what position the throttle plate is at. These throttle bodies on the hemi engines become dirty and cause codes like a P2175 and 2106. It will also make the ETC light flash, and cause low acceleration and limp in mode problems. Cleaning this throttle body will correct this.
A throttle position sensor might keep the engine from starting. Any number of things can cause a vehicle not to start. The starter and the gas line sensors are also a possible culprit.
Try the throttle position sensor
Throttle position sensor
The throttle position sensor (TPS) keeps the PCM informed about throttle position. The PCM uses this input to change spark timing and the fuel mixture as engine load changes. A problem here can cause a flat spot during acceleration (like a bad accelerator pump in a carburetor) as well as other drivability complaints.the throttle position sensor (tps) tells the computer where you have your foot while driving ( half throttle or quarter ect.)