Factory stock.
The 400 in the 1979 F150 has a 2 barrel carburetor , so unless your willing to change the intake manifold to a 4 barrel manifold and get a 4 barrel carburetor , I would stick with original equipment
where is the fuel pump rely on a 2005 f150 with a 5.4
i had the problem with my 97 f150, the power wire to the computer had melted on the manifold and had to be replaced, check the wire to see if its grounding out
its to the rear of engine under the intake manifold
underneath the intake manifold on the drivers side
Just downstream after the exhaust manifold
Try cleaning the Intake Manifold where the EGR valve is attached.
The bank 1 oxygen sensor for a 2005 Ford F-150 is located on the driver's side of the engine, upstream of the catalytic converter. It is typically situated in the exhaust manifold or the exhaust pipe just after the manifold. This sensor monitors the oxygen levels in the exhaust gases to help optimize fuel efficiency and emissions.
intake manifold leak due to rotten isolator bolts in the manifold plenum.
The temperature sending unit on a 97 F150 4.2 is Êlocated in front of the intake manifold. It is on the right hand side.
on top of the spark plugs in the intake manifold.
It is very hard.