Why does my car bog and die.?

When my car is in 1st gear and idling beliw 3000 rpm it will bog out and die. When i hut the brakes in other gear it will bog out but rarely die. When i am at a stop light i have to pull my emergency brake and put it in nuetral and feather the gas pedal to keep ut abive 3000 rpm ir it will die on me.