The rpms need to be high enough to keep the engine running. Most engines need at least 850 rpms to keep from stalling.
When the RPM of a car drops down and stall there is an issues with the air fuel ratio. The engine should be checked for vacuum leaks,
Vaccum leaks
It depends on the gearing of the car. If you are in the highest gear and 40mph in that gear is under the idle rpm of that car than you will stall.
a stall will not engage trans until a minimum rpm is reach depending on rpm range of the stall converter
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Your car will turn on and struggle at 100-200 RPM then die/stall out
If its a turbo car it will stall if the blow off valve is not shutting properly as the pressure drop is too much for the engine to keep turning, same with lpg when you idle the pressure in the engine drops and it will stall you can correct this by changing the timing
its probably just your idle kicking in when u stop, this keeps your car ideling at a certain RPM so your car dont stall, and die.
Your Idle Air Control valve may be sticking. Or the engine oil is to cold, thickens there is more power needed to crank the engine.
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Does your car have overdrive? Does it stall when going uphill? If you answered yes to these it is possible that your transmission kick down isn't working.The kickdown basically detects when the car becomes under load and shifts the transmission down a gear.
because if you stop immediately then the car will stall.