i'll start the car then a few second later it will die.

Did you also replace the fuel filter ?

Agree with fire bird338,and if you find the fuel filter to be ok,check the relay,then check that new pump.

And also check your air filter and clean throttle body with throttle body cleaner spray.

firebird338, yes i did has the fuel filter replacement @ the same time.

With the throttle body cleaning add some fuel injector cleaner to gas tank then take vehicle out on road and hit the passing gear a few times this will help clean out fuel injectors and remove any gum and carbon build up. Be careful no speeding ticket.