The incorrect electronic signals being sent by your bad throttle position sensor are also used by your automatic transmission's computer, to help it decide when and how to shift. check the shift cable, it may have broke or is way out of adjustment. this has a major effect on transmission shifting. The transmission shifts according to the throttle position and engine load (measured by manifold vacuum). What it might do is cause the engine to run at a higher rpm or a lower rpm, depending on the failure of the sensor. The acceleration problems that are the result of a bad throttle position sensor can also affect the way that your transmission shifts . Picture a little module in the car that reads how far down you have pressed the gas pedal. I recommend replacing the sensor if there is moisture on the contacts, its broken, or its cracked. Sometimes, the throttle position sensor in modern cars can go bad. Fault codes P2121 & P2122 are fault codes related the accelerator pedal position sensor or circuits. It's like a jerk that can throw your head back and a slight bang is heard. I knew I had already replaced the throttle position sensor (with an after market one) and did not consider this. For example, you might experience harsh or delayed shifting. If I gave it hard or full throttle it would shift fine, but normal driving it would shift through all the gears, each too soon, bogging the engine down. The throttle position sensor is important for proper automatic transmission control because it immediately establishes the driver’s intent, and transfers this information to the Transmission … The computer in turn adjusts the amount of fuel based on engine speed, whether it's accelerating or decelerating, fuel mixture, and throttle position. The throttle position sensor will not make the transmission go into neutral at an idle. A bad TPS shouldn't effect shifting, at least not directly. The starting problem and strong gasoline odor is highly unlikely related directly to the transmission. Signs that a throttle position sensor could be malfunctioning can include the check engine light being on or in the engine sometimes feels like it is going to die when the car is idling. This will either result in further damage to the fuel system, stalling, less than optimal fuel economy, and many other issues. (Down shift is okay.) Because the TP sensor is an input to the control module for various automatic transmission functions (e.g., shift points and torque converter clutch operation), a problem with the sensor can cause transmission performance issues. The throttle position sensor is located near the throttle body itself. If the throttle position sensor fails it can cause automatic transmission shifting problems. But I noticed that if I drive it a certain way, it is shifts smooth as silk. At the same time the transmission cannot read the signal and puts the transmission into high line pressure to compensate, which results in very hard shifting. if the cable is ok, then check throttle position sensor at throttle plate on side of throttle body. And sometimes even 1st to 2nd can be hard. the cable for downshifting. On some vehicles, it may be necessary to reprogram the ECM so that it can "relearn" the proper shift points for the transmission. so I started replacing & cleaning other related idol sensors. The TPS is mounted somewhere on the throttle linkage. With a fuel injection engine, the TPS tells the computer how far you have pressed the fuel pedal. You may need to move or remove some parts to get easy access to it. The Throttle Position Switch could have an effect on transmission shifting. 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