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      09-18-2017, 11:01 AM   #2
Jeff@TopGearSolutions
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Drives: C6 Z06, 09 335i, 10 335xi
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Does it smell like fuel at start up?

First thing I'd do is pull the plugs and see if they are fouled with fuel or oil.

Fuel would be an indication of bad injectors, oil would likely be valve cover gasket.

If they are fine and the plugs are in good shape at the correct gap then I'd start to look elsewhere.
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