I have a 1995 318i and well recently is been given me plenty of problems I have corrected all the problems but my switch started to give me problems. I went to turn it off and the car would not turn off. thus instead of buying a new switch I went to a junk yard and bought the entire ignition assembly with a key. now my car wont start. the key turns and the radio and other instruments come on, but it wont turn over. I heard the car has an igniton immobolizer what can I do