can any one help i've owned my 1999 e39 m5 for 2 weeks and i.m getting a little hesitation when i'm driving at a constant speed when the car is cold and warm and it does it at differant speeds?the previous told me he had changed one of the mafs just before i bought it also i have the coms pack and i can't get the phone to work i press the button for it and the phone lights for a second then goes out