问：发动机计算机问题（火花塞和线圈也在5个月前更换）。

大约6个月前，我的EML/Service＆Brake Light出现了。汽车开始跑得粗糙，不会超过50英里 /小时。我把汽车拖到机械师身上。经过大量调查，机械师说，发动机计算机将需要更换。他没有在没有太多调查的情况下这样做。他是当地的机械师，他在我的城市做所有进口汽车。他得到了客户的高度评价。他从宝马经销商那里购买了一台新计算机。他进行了编程并安装了设备。我把车回来了，一切都很好。 Last week, out of nowhere, when I started the car, the eml/service lights came on. The car was running rough again. This time the lights didn't always come on at startup. When not on, the car would run perfect. Car is back to mechanic. The codes he is getting are saying the eng. computer is a problem. He is still investigating because he doesn't understand how this happened. I am very confused too. Any ideas on what could be happening and what we should do? Help?

我的汽车有80000英里。
我的汽车有自动变速箱。