Four-wheel drive, also called 4×4 ("four by four") or 4WD, refers to a two-axled vehicle drivetrain capable of providing torque to all of its wheels simultaneously. It may be full-time or on-demand, and is typically linked via a transfer case providing an additional output drive shaft and, in many instances, additional gear ranges.
P0300,P0301,P0022,P0345 on 2005 F-150 Hello, have a 2005 F150 5.4L 4x4 that has started idling low, running rough, sometimes but not constantly stalling at idle (engine starts knocking and sputtering) and just seems to lack power after 55mph.