Scan on o2 counts goes to 800 need some help here.

I blew my HG replaced them, and there was other things wrong after that so replaced coil, ing module, plugs, fuel filter, cam sensor but every time I crank up my car o2 counts start in the 300 and go right to 800 ,thats running rich right? It will cycle some when your driving it but nothing like it use to could the o2 sensor be gone causing this? I am lost is this normal or not?

I guess this is normal but now its going to 000 and staying when this happens the car starts running real bad but you can throttle past it but this comes and goes replacing the fuel pump hope that fixed it.

o2 should jump around alot under normal driving and idle. if it is real slow or lazy,you should install a new one then go from there. 800 is not terrible rich,my car runs great at about 770

Did that no help its running real lean now so hoping the pump is going bad changing it out.

I read a post a while ago where the OP was experiencing the same issue and it ended up being a bad, new O2 sensor, I think he was using the same A/C Delco O2 sensor that was installed on the GNX, it seemed to be a common problem for that sensor.