Jessedvan

Hello and hope all is well. Im hoping you can help me. I just replaced my throttle body & accelerator pedal position sensor on my 2005 nissan 350z. I performed throttle body relearn and pedal position sensor relearn & idle air relaern. I aslo tried reseting ECU. Once i start the car... it immediately revs to 6000rpm and stays there... with out me touching pedal. I double checked the butterfly in throttlebody and it is closed and not stuck open. I also reinstalled old pedal position sensor just to see if that would stop the immediate high revs..
i am stuck and clueless on what to do next. Any ideas?