These are lean codes for both banks and you have a vacuum leaks, check the air tunnel from the air cleaner to the throttle body and the clamps and gaskets, there is unmetered air getting in throwing off the maf sensor and idle air control system.
You may have a vacuum leak, get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs! If that doesnt do it, you may need a new idle air control valve, it's bolted to the throttlebody
Pay attention to the PVC system and hoses as well!
Thursday, July 22nd, 2010 AT 1:02 PM