My 733i '84 started smoking same way about 2 months after I bought it used. Then, someone noticed water out of exhaust, said something about head gasket? Then stalled one day, and started back up. Then stalled next day, started back up, but not as easily. Next day, wouldn't start at all. HELP!!! I am a 42 year old Mom, and don't even know where the air filter is located!!!