If the X was sitting that long, the fuel is spent. And if you didn't drain the tank and fill with fresh, the gum and residue may have fouled the sensors. Fill with premium and fuel injector cleaner to burn that stuff off. In the mean while do some diagnostic work. Make sure all the coils are working properly and check the wires.

The fuel is a long shot, but possible.

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2011 E70 50i M Sport