Outer Limits 4x4 Board

when u are driving around the streets its ok but when u get out on the hiway doing about 80 it starts to lose power,u can pump the pedel and it does nothing u have to hold it flat to the floor. if u take your foot off the car will stall then when u stop start the car it runs fine till u start to get back up to 80.i have put a new fuel filter on but still does it

any help would be great

Try blowing back though the lines is it pouring black smoke out the back or no smoke at all does it have a snorkle or stock air intake set up

it has a snorkel but i have taken it off and it is still the same. the pump is a bit noisy