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The car obviously has multiple problems. One thing I'd check for that might be contributing to it running extremely rich is vacuum leaks. The ECM might be trying to compensate for what it perceives as a lean condition. If nothing obvious jumps out a capable garage can do a smoke test to either confirm or eliminate vacuum leaks as a problem. Good luck sorting it all out.
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Pat
2015 F25 X3 35i M Sport - Carbon Black
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