My 4.6 L has started running poorly giving me no power on acceleration and idling rough to include dieing while idling. It originally threw codes saying to replace the idle are control valve and the o2 sensor saying it was running lean. I replaced the IAC along with both front o2 sensors. I as well replaced the PCV valve hopeing for some results. The truck is no longer giving any codes and the check engine light is off, however it hasn't been running any better. I'm at a loss of what else to do and could use any ideas. Thanks