I have a 5 speed 99 328i that whenever I turn on the ac it runs fine and gets nice and cold but after a few min of driving I will hear a rattling sound from under the car then after a few min of that my service engine light will come on and when I try to accelerate my car will shake and not really have any power.:mad my assumption is that somthing is wrong with my compressor seeing how the problem goes away within a min or two of me turning off the ac. But I have never heard of a ac compressor making the whole car run like shit and while my car is running like crap the ac works just fine. Any one else had this problem??

I just posted a similar problem today.