the car only takes off only when I step on the pedal lightly if I try to step on

What is your question?

the pedal to take off like half way it will turn off it gains speed but slow because of how far I can step on the pedal but like I said I cant step on pedal more than an inch in a half down or it will cut off it acts like if I let go of the pedal ive done timing,fuelfilter,fuelpump,igniter,tuneup,o2sen,