first thing I would do is check the oil to see if it is full of gas...a little gas will kill the lube ability of the oil in a hurry and the rings will go quickly. Change the oil if it smells like gas, put new plugs in it, then fix whatever made it flood...stuck float or something that allowed the bowl to drain into the engine
I have seen many a plug that was wet with fuel that refused to fire properly after being dried off
