Hello, please help with an issue that's driving me crazy. My 1999 4.2 litre is showing fault codes p0171 and p0174, likely a vacuum leak. One of the common issues is the valve, tubing, or elbows in the pcv system. I want to remove the hoses and the valve from front to back in order to inspect properly. The pcv valve is on the valve cover, passenger side, and the hose goes: a)to a Y connector that leads to a connection near the fire wall and b) behind the intake manifold where it becomes impossible to follow. I've tried lights and mirrors to see where the hose goes but things are so tight behind the intake and so close to the fire wall that all I can make out is an elbow and then I cannot follow it further. Can anyone tell me where the end of that hose goes (where the gases are re-introduced into the intake) so that I can disconnect things at the pcv valve, the end of the Y connection, and the 're-introduction end', remove the whole apparatus and inspect everything without tearing apart a bunch of stuff to get at it? Replacing the pcv hose is shown at .3 hours in a '99 f150 labour manual, and so I'm thinking that it shouldn't be that hard to do but I'm a loss. If anyone can point me in the right direction, I would greatly appreciate it. Thanks.