Sounds like run-on, or dieseling, from the description. That is when the engine continues to run after the key is shut off, due to carbon build-up in the cylinders igniting left-over fuel. Not common.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue