Hello I Am a newbie and i have had my bmw sitting in my yard for a year. it is a 1992 325is and today was the first day i took it for a drive. so i took it to get a oil change. before i changed the oil it was running fine . then i drove it around a bit and it was driving fine. when i got home and parked it i was sitting in the car and it started idling a lil rough it went from 500 to 1000 back and forth . then the damn car shut off but it would start back up can anybody please tell me what the hell is going on with this car. this is the first time it has been drivin in a year so i am not sure if this is normal.

My poor Bmw has become a headache since i brought it home last march.