I have a 2001 f250 5.4l that I've been having trouble with recently, it all started with the truck acting like it was vapor locked on long trips (stalling out then wouldnt start for hours) and now won't start at all, it acts like it either isn't getting fuel or the air mixture is off, I've went through and replaced a lot of parts (fuel pump, fuel filter, throttle position sensor, mass airflow sensor, fuel injectors, ignition coils, spark plugs, catalytic converter) the only code it's currently throwing is an EGR code but my truck has no EGR (thus the catalytic converter replacement) the only things left that I can think of is the pcv valve and the purge solenoid and I could really use some advice from anyone who might've run into the same thing.