new plugs wires..ect...but sputters
 

i recently put a new set of plugs, wire,cap and rotor in my 96 350 vortec. right off the bat i noticed that it sputters when u step on the gas real fast when in park and also noticed that it will sputter when taking off....keep the gas on and it clears up. why would it be doing this....none of my wires are crossed. the numbers on the cap match the numbers on the wires so thats a no brainer., gap is at 0.60...it never sputterd before the new stuff was installed. i tryed some injector cleaner but no luck......coil?pvc? o2 sensor? any ideas. check engine light is not on, but comes on when pull trailers