Sometimes stalls or surges when hot, runs hot

Questions here are better with full 'year make model' instead of generic '318'.

A few generic ideas.

1. Check fuel pump pressure.
2. Run injector cleaner through the fuel system 'Extreme Clean' is a good one.
3. Clean the throttle body.
4. Does it have a MAF (mass air flow sensor)?

More ideas here

https://www.google.com/search?q=1989+Dodge+318+stalls+and+surges+when+starting

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cold engine idle surge. (problem)
RPM range of surge not stated
300-700 or 800 to 1500? (range is critical to diagnosis)

bad fuel
running summer fuel in winter (running old fuel?)
needs a tune up bad, see the list in the operator guide.
idle speed controller,sticking or EGR valve same. (clean them)
location not stated, so cant guess about local air temps.?
no other symptoms, lack of engine power? etc?
was it ok last week, or better, when was the last time it was OK?
1week, 1year?
surge , causes, on a tuned engine might be:
1: too lean. so lean the ISC can not control idle. rpm low, stalling
2: too rich, flooding, stalling, spark plugs foul (look at them)
3: weak compression in 1 or more cylinders.
4: bad spark.
5: air leaks, in the plenum causing , ISC to lose control.
why high RPM?

especially?
well that means it fails hot too.
and there is a simple tests. for hot surge.
is engine fully hot? 180F and holds solid there?
say rpm is about 800
and you turn on head lights, heater fan and (not AC) and defrost.
the RPM must hold or the ISC is failing.
ISC -= idle speed controls. (all EFI has this function)

I suggest check for vacuum leak and test fuel pressure.

shound most likly crank sensor/heat soak so to speak

my 2000 lincoln ls v8 runs great however sometimes it will stall at idle what could be causing this.

maps sensor

Have your EGR valve checked. I just replaced one on a 95 towncar. It's my girl-friends car. It was $50.00 at Auto Zone. Local shops wanted $300. to replace it.

Check the TPS switch and make sure there is no broken vacuum line also check for Codes.

Check your Idle Air Control Valve (IACV)

Here is the most common cause of surges and stalls, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.