In my experience with Camaros and 3.4L engines with the single wire O2 sensors, they are not picky and just about any quality brand will do. Bosch and Delhpi are the ones I would use. I would stay away from store brands like Duralast, or Master Pro if they even make O2s.

Check for any vacuum lines being broken or not hooked up, and alse the PCV "Y" that is inbetween the intake runners where it makes a "V".

Massey

 

Do you have a manual or automatic transmission? Do you ever use your parking brake? If the rear brake cable or internal mechanism froze up with the e-brake pulled, the brakes would act like you're dragging a big anchor behind you. Yeah, it happens. Jack the rear wheels off the ground, and with the trans in neutral, see how freely the wheels spin.

 

I will definitely check those lines. I haven't noticed any problems with them before, but I will run back over them. It is an automatic and no I don't really ever need to use my parking break. The only time I have is if I have it up on a set of ramps or jack stands.

 

I did however find a vacuum line that was randomly and mysteriously disconnected...