looks like you might need a new alternator... it's going on and off on you its trowing those symptoms its about to die on you... it still works but on high RPM's. and not charging enough the battery and causing the car to turn off on you... if you have a Voltage meter on you check the alternator directly see how much voltage it reads it will help you alot if you really need and aternator or a battery..... hope this helps

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2000 540i Sport Black/Black, Matte Black Grill, Powerflex Bushings, Tranny/Diff with Royal Purple, Black Valve Covers, Z3/// Short Shifter,