So my F150 V8 4.6l Triton I knew had some problems when I got it. Was obtained from an auction. I always have my vehicles checked out by a mechanic if not purchased from a dealer. My brother and friends I know are mechanics and I know where I can get the replacement parts new cheap. So if one can't help I go to the other. But my codes coming up are P01131, P1151, P0171, P0174. Now I already had the valve gaskets replaced, spark plugs repair the Vacuum leak, oil change, filter replaced. I was trying to find out after reading another persons post with practically the same problems. Now the PVC not replaced yet but that was the first thing I was reading about a few days after I got this Truck. Any ideas. What to do next.help.