Mods in Sig.

Long story short. I dropped my truck off at a body shop on 1/02/07 to have a bed side fixed. I had no problems before and when I went to pick it up I took off and the truck started running funny and the check engine light came on. I got home and checked the codes and I got P0174 (lean bank 2) and P0300 (engine misfire). I figured the O2 sensor went bad so I replaced it with a new one and it changed nothing. I checked all wiring and connections. I also checked for exhaust leaks and nothing. What else can I look for?

I am stumped...

Thanks in advance.

 

Ok I checked to see if my O2 sensor was getting power with a test light and only 1 prong has power. How many prongs should have power? I followed the wiring up into the engine bay and everything is fine. Also it seems that the O2 sensors work fine under WOT throttle just not part throttle or at idle.

Any help?