What's your idle set at? What flywheel do you have?

What is your 'Coast FC Adjust' value set at? See here, last paragraph: http://www.ecmtuning.com/wiki/revlimiters

Playing with this value can help stop engine speed from dropping so much coming to a stop. The lower the engine speed drops the harder it is for the vehicle to recover. I've seen some pretty intensive studies on stuff like this and once you drop below a certain point (RPM value) it becomes incredibly hard/unreliable to get back to idle speed, particularly in a reasonable amount of time.