Alright I THOUGHT my truck was running good and had somehow gotten rid of the sputtering/stalling/bogging problem. Not so as I found out last night at 1 in the morning. This is what happened. At about 6, I went and filled it up with gas. It was at about 1/8th of a tank, and was running GREAT, I could actually put it to the floor and it wouldn't sputter and hesitate. When I unscrew the gas cap, its always got a lot of pressure in the tank. After I filled it up, on the way to the ball field, it ran just as good. Then, at about 1 when I left the field, it was sputtering and bogging so bad that I could barely get it to 30 mph. What could be the problem?