2005 Grand Prix. When the car is cold it starts just fine but after it has been warmed up you have to press the gas pedal to get it to start. I am going to try and clean the throttle body but has anyone figured out what is causing this on so many cars. I have changed the plugs and wires and it didnt help at all. There is not an external fuel filter or regulater on this car so I want to try to figure it out before replacing the fuel pump. Also when I take off its a little hesitant and then you can feel it take off pretty quick. Any ideas would be great. I dont know a whole lot so please explain pretty good