goldenyearf-150

Does anyone know what is causing this code. The symptoms are rough idle occasional miss and overall lack of power. Auto zone said to replace the maf which i did but that didnt fix andything. Some information that may be useful is my driverside o2 sensor was black I cleaned and reinstalled it. My passenger was clean but the cat was so hot the frame next to it I couldnt even touch it. Also does anyone know where the pcv valve is located on this engine its a 2006 4.2l v6 in an f-150 auto. thanks guys