I am getting 4 codes, P0171 and p0174, I read the post about the intake, we tried spraying break clean around the intake but did not turn up anything.. I am also getting p1131 and p1151. Do you guys think these are related or should I treat them as seperate issues and replace the o2 sensors and pull the intake and do gaskets etc...?

Thanks
Robert

 

I had the same issue a while back. Here is a link to what I did to fix my many vacum leaks wich resolved "my" issue. Good luck!

https://www.f150online.com/forums/v-...y-gaskets.html

Edit: I also had replaced my upsteam O2 sensors prior to the gaskets and it did not resolve my issue. Turns out the O2's were just doing their job. At around 100K, they probably needed to be replaced soon anyway.