I have had my 1986 Bronco 5.0L EFI 4X4 for about a year now. The problem is that it's a dog! Going up any grade on the freeway, nearly requires me to floor the accelerator just to stay at the speed limit. I have changed the fuel filter recently, but that didn't seem to make a difference. IS THIS JUST THE NATURE OF THE BEAST??? I am looking for other owners to share their experiences. Thanks.