My Hyundai stalls when cold and sputters when i drive at low rpm. its fine at a high rpm.

engine stalls when parked? or driving fast>? not told. engine stall is 0 RPM engine as in dead.
and restarts easy.
does engine STALL going from park to DRIVE or REVERSE.
that is a super rare even so rare I think it is just coincidence.
the cars cab heater, blower fan turned on low to high? at the dash knob HVAC.
or at engine fans, Radiator rear or font, fan, condenser HVAC.

first off the blower fan is fused, say about 20amps, and is never going to overload the battery or 100amp alternator ever, not possible. nor the GOOD engine,
wiring hacked yes. my answers or for NOt HACKED CARS OEM STOCK.

answer 2;
engine is very sick and weak, and RPM is too low say 600 not 800 or more.
so any load on the engine stall is it, blower or going in to drive.
in drive, foot on brake RPM is 800 hot or 1500 cold. not 500 ever.
those need to be known first.
or get the car services for SURE if you can demonstrate he failures. to them.
this answer if for any engine on the hair line cusp of stalling before it does stall.

see?

Check out related help links to troubleshoot these problem:----Click the link below:---Idles Fine but RPM jumps in drive mode? http://technoanswers.blogspot.in/2012/07/idles-fine-but-rpm-jumps-in-drive-mode.html
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--------How to adjust rpm on 2009 dodge charger SRT8?

http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
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Engine cuts out at 3000 RPM? http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html

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Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

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High rpm in neutral? Inconsistant high RPM in neutral? http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

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Jetski Sputters and Low RPM? http://whatisbyme.blogspot.in/2012/07/jetski-sputters-and-low-rpm.html

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Fuel Injection Problem And RPM suddenly increases http://whatisbyme.blogspot.in/2012/07/fuel-injection-problem-and-rpm-suddenly.html

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2005 Toyota Highlander: Engine runs hard RPM below 3000? http://whatisbyme.blogspot.in/2012/05/2005-toyota-highlander-engine-runs-hard.html

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1987 Toyota Camry: RPM Drops going Up hills? http://whatisbyme.blogspot.in/2012/05/1987-toyota-camry-rpm-drops-going-up.html

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Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500 http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html

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1990 Toyota 4Runner: Engine cuts off when reaches 2000 RPM?

http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html

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1999 Toyota Camry: Erratic stalling and high engine RPM at idle?

http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html

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1995 Toyota LS: Misfire at idle or low RPM http://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

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Lexus RX: Tapping noise under Valve Cover At Low RPM? http://technoanswers.blogspot.in/2012/04/lexus-rx-tapping-noise-under-valve.html

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These will help.
Thanks.

Check out related help links to troubleshoot these problem:----Click the link below:---Idles Fine but RPM jumps in drive mode?http://technoanswers.blogspot.in/2012/07/idles-fine-but-rpm-jumps-in-drive-mode.html
---------Mitsubishi Lancer rpm needle bounces?http://technoanswers.blogspot.in/2012/02/mitsubishi-lancer-rpm-needle-bounces.html
--------How to adjust rpm on 2009 dodge charger SRT8?

http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
---------
Engine cuts out at 3000 RPM?http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html

---------

Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

---------
High rpm in neutral? Inconsistant high RPM in neutral?http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

-----------
Jetski Sputters and Low RPM? http://whatisbyme.blogspot.in/2012/07/jetski-sputters-and-low-rpm.html

--------
Fuel Injection Problem And RPM suddenly increaseshttp://whatisbyme.blogspot.in/2012/07/fuel-injection-problem-and-rpm-suddenly.html

----------
2005 Toyota Highlander: Engine runs hard RPM below 3000?http://whatisbyme.blogspot.in/2012/05/2005-toyota-highlander-engine-runs-hard.html

---------
1987 Toyota Camry: RPM Drops going Up hills?http://whatisbyme.blogspot.in/2012/05/1987-toyota-camry-rpm-drops-going-up.html

-----------
Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500 http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html

----------
1990 Toyota 4Runner: Engine cuts off when reaches 2000 RPM?

http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html

------------
1999 Toyota Camry: Erratic stalling and high engine RPM at idle?

http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html

---------
1995 Toyota LS: Misfire at idle or low RPMhttp://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

-----------
Lexus RX: Tapping noise under Valve Cover At Low RPM?http://technoanswers.blogspot.in/2012/04/lexus-rx-tapping-noise-under-valve.html

----------
These will help.
Thanks.

It can be clogged intake manifold or issue with low fuel pressure or the problem is low battery voltage or issue with clogged fuel filter.Inspect all this basics.For more troubleshooting,click the link below and go through troubleshooting:----Stalls, Sputters and Pops Through Intake Manifold? http://whatisbyme.blogspot.in/2012/05/1995-toyota-corolla-stalls-sputters-and.html
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Erratic stalling and high engine RPM at idle?

http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html
--------
Stalls and Stops While Driving? http://whatisbyme.blogspot.in/2012/05/1994-toyota-4runner-stalls-and-stops.html

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No Idle and Stalling issues? http://schematicsdiagram.blogspot.in/2012/04/ford-maverick-no-idle-and-stalling.html

-------
Vehicle starts then stalls and shutdown? http://schematicsdiagram.blogspot.in/2012/04/1992-chevrolet-stalls-and-shutdown.html

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Engine stalls when gas is given? http://technoanswers.blogspot.in/2012/01/engine-stalls-when-gas-is-given.html

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This will help.
Thanks.

is this the diesel version or petrol

sounds like transmission is either loseing lock up or shifting out of high gear, need to check tps and tranny for codes

driving with low fuel is never a good idea. It can allow all kinds of contamination in the tank be picked up and sent to the engine clogging the pump, and injectors.
I'd start with a good fuel system cleaner like Tecron. add the contants of the bottle to the tank then put at least 12 gallons of gas in the tank. You may need to do it a second time especially if you notice improvement but it's not yet up to par.

If you were driving a voyager I'd suspect the fuel pump is starting to fail.

if the ecu does test good then i"d recommend changing the fuel filter.

he diff between a lockup vs non-lockup torque converter is the lockup simply locks the torque converter to the transmission direct electrically so there is no slippage in high gear. And there is no advantage to using a 2300 rpm stall converter if you are running a basically stock cam. However if you insist on this high stall speed torque converter you'll be able to lay down some impressive black marks froma standing start! One final note...unless you change your rear end gears your RPM's at a given speed remain the same. All the 2300 rpm does is your motor will rev a bit more before you start moving