I have a 2002 f150 I am trying to get running good I changed the intake gasket,plugs,coils,fuel filter,pcv valve and it runs fine then it shows p0171 and p0174 and it starts running really bad I can shut it off and start it back up and it will run good again for bout 15 mins then codes will come back on and it starts acting up again I am running out of things to fix I cleaned the mass air flow and still no change I had a mechanic check intake and it's not leaking anymore it takes a little longer then normal to start too any help will be appreciated

 

PCV hoses are notorious for splitting

 

I'm sure you cleaned the egr passages under the throttle body, Yes? Patman is probably on to something.

 

I checked the hose and I can't find a crack or split I sprayed it and can't see and leaks on it while it's running

 

Yes I cleaned that when I cleaned the throttle body