My 92 E150 Wont Accelerate

I Have A 1992 E150 It Will Only Go 5miles Per Hour With It Completely Floored It Starts And Idles Fine When I Give It Gas It Shakes Real Hard Ive Changed The Fuel Pump Complete Tuneup Cataletic Converter Coolant Temp Sensor O2 Sensor Does Any One Have A Clue Wats Going On

did you try the fuel filter may be clogged.