hi , i bought a e36 318is a few months ago and everything was fine, until yesterday i started the engine and i heard a bang, suddenly the car cut off, then wen i started it again it wasnt reving properly and it sounded as if the exhaust had blown, its still doing the same thing and i have no idea what is wrong with it, and every time a let go of da accelerator the car cuts off, also wen i do press the accelerator the revs keep jumping and tries to cut off, i have checked my air intake but it looks fine and i also put a new air filter in and its still the same, can someone plz help me thanks!!