y does my car idle up n dwn while goin down the road

What is your question?

also when it idles up n down it tries to dies and when its not tryin to die it acts like its not in gear? this happened tonight! i was omw home and the car was idlin up n dwn tryin to die then all at one it ran ok but acted like it wasnt in gear at all but when i got into the driveway it finally started pulling again