Truck cuts off while driving down the road.

i worked on jaguar xtype diesels which is a ford engine similar. and that issue was more than likely caused by a clogged or faulty egr valve

check the wires on the feed to the fuel pump ,,also check that it hasnt got the cut out thingy on top of the fuel tank like the ford explorer,unless this is only fitted on the europeon models .?

probably cause by the a/c cutting in and out or running at idle . Fit an idle compensator to the system throttle or raise the idle speed 300rpm.

Surge usually means its getting extra air (VACUUM) from somewhere, usually a vacuum hose has come loose or developed a hole or crack letting extra air into the engine.

SCAN VECHICLE COULD DIS IGNITION MODULE OR CRANKSHAFT SENSOR ALSO FAULTY PCM.

you went down a pathm but unfortunatley a dead end, was the cat. converter noisy, like loose pebbles....just curious......anyhow, it could either be a fuel starvation problem or electrical cut-out caused by tune-up, im not sure whether you service the car on a regular basis, but based on the age of the vehicle, certain inherent problems are going to occur, and tender loving care will be required

i hope this helps
email me back with more info if i can help

Have you checked your fuel filter or fuel pump as these can cause your engine to to shut off, but there usually is some sort of warning, but not always.

Probably a loose wire. Make sure batter cables are tight and check for lose ground wires.

Water in gas.

If you replace your power steering pump has noting to do if your car die
if you have a problem whit your power steering system the only symptom you will have is a real hard steering wheel.

if your car randomly die may be a false contact on your crankshaft position sensor.

is located next to the crankshaft pulley (harmonic balancer)
tray unplugging it and cleaning the terminals whit electrical contact cleaner (sale on auto part stores) and if is to rusty you may have to change the sensor or the wire plug.

NOTE is CRANKSHAFT sensor not Camshaft they sound a like.

it may be a good idea to get you car scanned for trouble codes
most auto part stores do it at no charge.