ya i dont have the manual and im not sure of the wires
so can anyone tell me what goes to what or a wire diagram
please

If you get a harness is much better since there are no need of cutting wires just plug the harness and the stereo. In case you need the wiring code go to this site:
http://www.the12volt.com/installbay/stereodetail/545.html
or
http://www.installdr.com/Harnesses/GM-Wiring.pdf