What's the reset process for a new accelerator pedal on an '08 3.8L?

[showme]

My grandkids '08 went into limp mode (reduced power) and I've been throwing parts at it to try to fix it. I installed a brake pedal position sensor and had it calibrated, but it's still showing reduced power, so I installed a new accelerator pedal. But after I did, the car's idle was crappy. It sounded weak and was revving up and down (not bad, but noticable),  so I figured I had gotten a defective new pedal and removed it and put the old one back on and the idling problem disappeared. While checking out videos on some other GP subjects, I came across one for resetting accelerator pedals by turning the key to accessory, slowly pushing the pedal to the floor and holding it for 10-15 seconds and letting it up slowly. But the guy said at the end of the video that each vehicle has it's own sequence for resetting, so I need to know if anyone can tell me the correct procedure for doing this on our 2008 Grand Prix 3.8. I want to try putting it in again and see if it will work correctly by resetting it, which I didn't do last time. Thanks for any ideas or comments. Lee 

Edited 1 hour ago by showme