1976 f350 with 1978 ford 460 dies or runs really bad when hot

Ranger not ford f100 Ranger.
When did it last run perfectly, last week, last decade or? never seen it run right..
lots of causes over up to 50.
I gets warm means engine,or outside air? temps.

so the spark plugs are bad or fouled. replace those old HV spark wires now.
it's over heating? the engine.
bad fuel
the classic answer is
bad engine, bad spark, bad fueling , in that order
or is the cause (or EFI failing)<< sensor etc.
this USA car (if is ) can OBD2 scanned easy, scan it.
do you want us to guess,? only.
or do tests, will you buy test tools to solve this?
there are tests for each cause of failure.
die out we call stalling engine,
when it wants to stall, can the fast right foot save the stall?
I guess car engine starts and runs cold? every time?
ever get a turn up,

engines 1996, diagnosis is best done, knowing first what is there,

2.3 L OHC I4, Pito LL23 4 cylinder but 8 spark plugs, yes.
3.0 L Vulcan V6
4.0 L Cologne V6

so when dead, and warm dead, check for dead spark?
check engine compression above 150psi on all cylinders
check fuel pressure when dead./

lots really,
scan it yet.
no year car told
no country told
answers will be hard, wrong or generic, all not good really.
what does WON"T IDLE mean
idles too fast hot or cold
idles too slow hot or cold.
stalls hot or cold.
does engine make full power hot and cold both?
??????? tell the good and bad or answers will be wrong or wild guessing./

this 17 years old a good run. nothing new here on failures this old.
all car fail that is what they all do eventually. (entropy etc)
let me guess never fails in others hands
and scans show nothing wrong, but sure too late then, they are gone.
so is and engine problem, so we focus there.
engines (gas, in order fail for 3 ways)

1. engine is bad, or cat melted (no) and egr stuck open (no)
2. bad spark (fuel can not burn lacking spark so why skip #2?)
3. bad fueling. too much or too little

in that order,

not enough evidence stated.
RPM's sink on start sometimes dies then usually it catches itself, idles high a few seconds then lines out.

runs great hot engine, so I guess fails only cold engine.
so bad spark plugs, bad spark coil boots or bad COPS
or bad CKP or CMP
why not just put in new plugs and new boots,
17years old those are NEVER GOOD.

ENGINE IS: 3.0L 2v or 4v (means 6x2 =12valvs or 6x4=24vavle heads.???? it has COPS, coil over plugs(spark)
6 cops ,6 new spark plugs and 6 new boots.
or learn now scan and drive,
or scan in the morning dead cold as the RPM go nuts
and does it misfire going nuts the RPM> misfire is spark first
or flooding 2nd the cold fast idle speed is wrong (IAC)

all I here is almost STALLS at cold start means why below 800 rpm hot and 1500 rpm cold so stalling is what MISFIRE?
can you prevent the too low RPM and stall with fast right foot action?
I say bad spark if not bad spark that is leaking injector or pair

learn to listen and feel for misfire,
and to use the right foot , adding throttle extra air to make it burn clean. Misfire s mostly violent. felt , heard, and see if you view the engine shack.
that is all I have but scanning it failing is how you fix cars

nobody can fix working car delivered a work car...
I have scan tool that logs and then play them back and bingo
GOTCHA. (P0306, and number 6 injectors is bad) see?

tune it up yet? which engine?
stalls hot or cold engine or both?
can you save the stall. by fast right foot action????

1. easy?
2. kinda hard?
3. impossible?????

no need guess; we can diagnose it.

there are lots of causes (50) for but just 4 in physics.
1: bad 12vdc power to EFI. system.
2: lost engine compression, 1 or more cylinders.
3: lost spark to 1 or more cyl.
4: bad fueling, too much or too little.
and other odd causes, EGR stuck open tops that list.

1 part down 49 to go on a guess? really?

check that the floats needle/seats are not blocked. check main jets for blockage. I would be checking the carby as carbys left standing for a period of time build up corrosion inside and tend to have blockage problems until cleaned out.

Are you getting white smoke or no smoke from the exhaust after failed start attempts?
When the FICM was replaced, did Ford check the glow plugs and injectors for proper operation?
Are you using an engine oil heating element or is the engine dead cold when this happens?
How long does the engine run the first and second start attempts before it stalls and dies?

Sounds like the engine is starving for fuel - plugged fuel filter, failing fuel pump, malfunctioning fuel regulator, etc. Have the fuel pressure checked.

unplug the injectors 1 at a time to listen to change in the way i runs,locate the cylinder that doesnt really change and inspect the plug,wire and if good then it may be a dirty or clogged injector,try addind seafoam to the gas and drive it for a while,it may smoke for some time but it should clean the injectors and valves really good.if it used oil alot before it may be carbon on the valves which seafoam helps clean them or you can squirt cold water in a spray bottle into the intake while running and the water explodes the carbon off the valves but it can not be really hot or damage to the valves will happen

Are you sure your idle ports ( size of pinhole) in carb aren't plugged with something? What happens if it starts to die, and you give it a quick squirt of WD-40 , down throat of carb?

On older, carbureted engines, cold stalling (and hard starting) is most often due to an automatic choke that is sticking, misadjusted or broken. Cleaning the choke mechanism with aerosol carburetor cleaner may free up the choke allowing it to work properly again. If the choke housing as an electrical heating element, the element may not be receiving voltage when the key is on, or the element may have burned out (check resistance with an ohmmeter).

Other causes of stalling with a carburetor include an idle speed adjustment screw that is set too low (turn screw to increase idle speed rpm). The engine may stall if the idle fuel mixture screw(s) are not adjusted correctly or the idle mixture port(s) are dirty or clogged with fuel varnish deposits (clean the carburetor and readjust the idle mixture screws for smoothest idle). Stalling can also occur is there are vacuum leaks in the carburetor, under the carburetor (bad base gasket), or any vacuum hose connections to the carburetor or intake manifold