Just purchased 01 Expedition 5.4, 59000 mile. Tested and drove great. Two days later started hesistating on accerlation at any speed. Idle and accel is great. Can't get a scan until Tuesday. Meanwhile, I have been reading this site and trying what I can until I can check for codes. I have read a lot about PCV leaking at an elbow at the back of the motor. I go outside to check and I do not have a PCV in the motor. It is an open hole. There are no lose or disconnected hoses or lines anywhere. I checked for 30 minutes and I do not have a clue where the line would go if the PCV was there. I need to add that the previous owner had installed a K&N air system. Any help is appreciated.
I also pulled all the COPs and checked the resistance and everything is up to specs.

 

the pcv line goes to the back of the TB are you sure the pcv is gone??????

 

It goes into the rear of the intake elbow behind the throttlebody.