The day before our trip, we were going to Christmas with family and my Yukon laid down on me! Started hesitating and wouldn't go when giving it gas. Got it off the road and when I came to a stop it stumbled and died. Tried to crank it up and it would just run for about 2-5 seconds. I'm thinking fuel pump, any other ideas? With 204000 miles I guess it was just a matter of time when something would break.