Folks, I thought I'd jump in on this post since I also just encountered the P0123 fault code on my SRT6 that I purchased a few weeks ago (no mods that I am aware of). The gas pedal was unresponsive while driving at times, and when pushed to the floor while in neutral or park would get no response. I restarted the car and same thing. I drove home and by the time I got home everything seemed to be good again. I checked the codes and P0123 came up. So, first thing is to check this great forum for info. From what I have read, the most likely (but not for certain) root cause is the pedal assembly. I found this on ebay and just want some confirmation that this is the best course of action for my situation. Thanks!

05 CHRYSLER CROSSFIRE SRT-6 GAS PEDAL ACCELERATOR PEDAL OEM 1703000104 | eBay