2008 BMW 328 - Valve cover, now won't start

2008 BMW,replaced valve cover gasket,ran fine turned it off, but went to start it,it won’t start instead it start flooding the cyl.plugs out crank it renstall plugs again before I started car got flooded replace new plugs,still same problem (flooding).

I don’t understand the problem. You description lacks clarity and punctuation. Please try and make it a bit clearer so we can answer.