my 2010 Mariner stalling

What is your question?

if the engine is cold, it will not stall. Once the engine gets warmed up the idle will go way down and it will stall when you come to a stop. It also smells like gas when it stalls. It usually starts up, but today when the key was in accessory position, it sounded like it was trying to start, but didn't. I turned the key off, and tried again, and it started.