Error Codes

How do i read/pull them? My check engine light everyonce in awhile, will come on under hard acceleration, and when i let of the gas and try to accelerate hard once again, it is major sluggish. Damn thing doesn't pull hard at all.

got to autozone and tell them that your check engine light is on and they will check it for you and if they cant do it for your car ask them for a gm code key. then go under the steering wheel where the fuse panel is and theres a place to put that key. and then the codes will flash back to you.

Thanks