Rockabillydatsun

Hello brother and sisters , Soo lately I've been having a idle issue. I drive it in the morning , no proplem. It only happens when I drive it home from work. It takes me 25 minutes to go home and it's an incline . It only happens when I'm at a stop light , or complete stop. But it won't die. If I give it gas the idle will get better. Once I turn it off , it seems to back fire and engine shakes a bit. I try to turn it on and it won't turn over , once it does I'll have a weak idle making me give it gas to make it better but then Again fails to keep idle. Any help?