car: ek hatch ls swap.

it starts prefect when its cold. but after i drive it around for awhile then stop and shut it off like to run in a store or getting gas(still hot). i go to start it again and it starts the dies out. if i dont feed it gas n keep the rpms up after about 10 sec if will idle but it will be rough like its misfiring. i have change the fuel pump,spark plug wire and plugs,and the fuel filter so far the filter helped a little bit. ne ideas?