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  1. 1997 E39 540i - varies between running too rich and running too lean

    BMW 5 Series - Tech Talk For All Gen Of 5 Series
    OK, so my garage told me that my pencil coils were slightly loose, and that they'd tightened them. They said I'd know if they'd come loose because I'd get a misfire. I had a diagnostic done with a view to getting the car chipped but was told that it swings between running too rich and running...