Malibu 02 backfire problems and fuel problems.?

try starting the car with the gas pedal 3/4 to the floor, not all the way floored . if it starts better then have your engine coolant temp sensor looked at. if the temp sensor is bad it will think the car is colder than it is and add more fuel, opening the throttle will create the extra airflow needed.this condition will always make the car run rich unless you are driving full throttle all the time.