HELP!!

[munchquiin09]

I have a 2001 GMC Jimmy. It has randomly been shutting off when at a stop sign or a red light. Sometimes it takes a struggle before i can turn it back on. However the AC, and radio remain on during when this happens. It sometimes accelerate on its on aswell. I have had the Check engine light for a while already. When i read it it gave me the P0410 Secondary Air Injection System code. Can this be what is causing it?

My uncle has tried fixing a couple of things, but it continues.

[gmtech4]

clear the code ,drive it again to see if it returns ,,,if yes the code has to be gone thru step be step