2002 windstar van, has new fuel filter, intake runners have been cleaned, but van at highway speeds 50/60mph when you go to accelerate further it bucks. It will do 80mph without a problem, but will buck the whole time it takes to get up there.
Optional Information:
2002
Ford windstar 3.8
Already Tried:
new fuel filter, new ignition wire set, runners in intake were all caboned up they were totally cleaned