Steven

I drove my jeep everywhere, decided to head to the beach. At a half tank or less it runs fine, but when I filled it up the jeep bucks, skips and runs rough in first and second gear. I thought it may need a new fuel pump and filter. Replaced both. The same thing, under 3/4 tank of gas runs fine. Fill it up and runs rough. Changed the plugs, still the same issue. Any ideas?