2004 club car gas hesitation problem

[Bigpond17]

I have a 2004 club car with a FE 290 engine my problem is when you press on the accelerator it starts to run and then cuts off this will continue as long as you hold the pedal down whether it is in forward or reverse. I have replaced a new carb, cleaned out fuel tank, checked all vent openings, replaced fuel pump, checked all fuel lines, new fuel filter, sometimes it will run fine for about a couple of minutes but when you stop and take off again it will go back to the same way. The strangest thing if i jack the cart up and start it it will run fine in forward and reverse when you let it back down on the ground then it will go back to the run and stop situation. I am Frustrated.