I have like no power and ****ty pick up

MY buddy put his scanner on my truck there was a lean code he said a its a bad vacuum line but I can't find a bad one where should start looking for it

 

Start at the beginning, what engine are you working on? Some basic ways to locate intake leaks, using a choke cleaner spray, spray all hose and gasket areas, an increase in engine RPM will point to the defect. Another method is to use a hose and listen for air rushing at all joints, like a doctor listening to your heart or lungs.

 

It's the 4.6