Ok so today for the second time since I have owned this truck after it has sat for a hour or so and it is on a hill with the front pointed down it cranks for ever and doesn't want to start. By putting the pedal about 3/4 to the floor it will start. If I had very little fuel in the tank I could understand this but it has more than 1/2. Any ideas? BTW 92, 3.0 5sp 4x2.