Help me, help me please! P2135 error code throttle position sensor
 

So I was driving my car and I was slowing down because I was coming to a light. The light turned green before I stopped and while I was rolling stepped on the gas and nothing happened... I floored it but still nothing. The service engine soon light came on. The car was still rolling so I pulled into a parking lot and turned the car off. I turned the car back on, the light was still on but the car was operating properly all the way home. The car has done this multiple times since then. I took the car to autozone and I got Error code P2135 Throttle position sensor range/performance. "Code P2135 indicates that with the ignition on the PCM detected the difference between the throttle/ pedal position sensor / switch A signal and the throttle/ pedal position sensor/ switch B signal was greater than the maximum allowable value."

Please help. I haven't been able to find just the sensor and if I do need to change the entire throttle body how do I know which one to change?

P2135 is for bank 1, the passenger side throttle body and it must be replaced as a unit. (no parts/sensors are available separately)

If you know how to use a multi-meter you can use the factory shop manual is here: Index of /FSM/G37/Sedan/2011
Look at "EC.pdf" page 1031 to troubleshoot.