Grand Prix gt1 2004 with 40,000 miles 3.8

Get a coolant flush and change the coolant temp sensor. It's running too rich and because of that you have to give it gas when it is warm. The reason you have to give it gas is because when the car is off, when you press the gas, it actualy leans out the fuel until it starts. You'll prolly get a code soon and it will read P0128. It's the temp sensor. The reason it's the coolant temp sensor is that it thinks it's running colder than what it really is, and compesates by giving it more fuel. Because of that, it wont start when it's hot/warm. Hope this helps.