I have an 01 6.0L that is will hardly run whenever you give it gas it falls on its face. I dont hear noise from the fuel pump and with the codes Im getting(banks 1and2 both lean and a knock sensor) I have been told it looks more like a leak somwhere in the intake than a fuel pump because it will run ok at idle and the pump isnt making any noise. Anyone with some ideas please tell me this things really got me scratching my head! Replaced all O2 sensors plugs and wires and cleaned MAF sensor none of this helped at all.

Thanks!

 

Intake vacuum leaks are very common. First step is to get a fuel pressure reading.