Could be time for a tune up.
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.
Travelling to slow in a high gear, so clutch in and lower the gear.
Check your transmission fluid level and also if the gear chamber is not well greased then it will make them stick causing the vehicle to stall.
A Clean Stall is happens in the aircrafts normal cruise configuration. A Dirty Stall is occurs in the landing configuration, landing gear, slats, flaps in the landing position.
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A problem in the fuel line could cause it to stall. On a stick shift, letting off the clutch too soon would cause the vehicle to stall.
The vehicle would stall when put in gear would be the fuel pump. The fuel pump is very weak which would explain why in neutral the vehicle starts if it gear it would have to have more gas.
Which gear - 1,2,3,4,5,6???
Is your clutch bad or wearing out ?
Need to know the year and what it is in.
torque converter or solenoid problem most likely if it runs out of gear ok.
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