Mostly idle speed too low

You need to have your car checked by the repair ship. Most likely your idle speed is too low and there are many things that control the idle.

Emergency solution: Before you brake down, put one foot on the gas padel, one foot on the brake, while you brake down, you push gas padel down the same time, try to maintain engine speed above 900 rpm all the time, so you do not get stall. You have to be a skilled driver to do this, and it is a temp solution, problem has to be solved.