Hi, I have a 2005 Ranger XLT 4x4 4.0. I just finished a rebuild because the timing chains messed up. I replaced all of thr timing components including the pensioners. I also replaced all of the lash adjusters, oil pump, water pump, spark plugs, spark plug cables, camshaft position sensor. I have this terrible knock that sounds like it's coming from under the plenum. The engine idles well when cold and before it reaches operating temp. As soon as it reaches operating temp, it starts to stumble and shuts off like a light switch. I've been told that I possibly could have a vacuum leak somewhere. Anyone have a diagram and information on where each line goes?