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Did you figure anything out on this. I have a 2005 and for some reason everything is different on the internet then my truck. My truck has a line coming out of the passenger side valve cover just behind the oil fill toward the front of the engine that plugs into the intake hose just in front of the throttle body. On the drivers side there is another line coming out of the valve cover and going back to behind the intake. I cant quite see what it plugs into, however what ever it plugs into looks like it has water running through it. My truck is throwing p0171 and p0174 and I cant figure it out. the only thing I can think of is that my pcv system is not working properly and it is causing a lean issue.