Question

2005 Nissan Altima S 2.5L, car idles-no response when the gas pedal is pressed down, and I got the engine code P1126 and P1122

Answer 1

trace the cable linkage from the pedal through the firewall up to the throttle cable in the engine compartment, for something unconnected. (this would be a generic answer for cars in general)

Answer 2

P1126 NISSAN - Throttle Control Motor Relay Circuit Open
Read more: https://www.autocodes.com/p1126_nissan.html

P1122 NISSAN - Electric Throttle Control Performance Problem
Read more: https://www.autocodes.com/p1122_nissan.html