hello therei need to know, my e36 engine got problem with the rpm. it is not stable. sometimes, when i drove the car and stop at the traffic light, at first the rpm will decrease below 500 and then the engine will off/dies.i just change my airflow sensor one month ago but the rpm is still same. i sent my car to one of the mechanic at batu cave and he also cant fix the problem. so now what should i do.for information i am a new user with this car and just bought it about 2 months ago. please help me sifuu..