When park over night corolla spark plug wet with gas?

Answer 1

The spark plug being wet with gas could be a multitude of problems, but, you're in luck, the most likely cause would be a leaky fuel injector, or multiple ones, if it seems like the car is running rich (strong gasoline smell from exhaust while running) that's probably your problem. The injector isn't fully closing when you shut the car off and its dripping gasoline into the open cylinder and its soaking the plug. You may notice the car taking longer to start in the mornings (or after a longer period of sitting) because the fuel rail is draining through the open injectors while the car is shut off. You should have this diagnosed by a trained technician, but its a point in the right direction.