I already put 4 spark plugs, fuel filter, air filter, and just put a mass air sensor on yesterday and I put fuel injector fluid last week. Car starts in the morning when I press the gas to the floor while starting the car and will make one or two stops at stores and start up one or two times, but then when I try to start it after driving to more than 1 or 2 places it will not start. I would try and turn the car on and it turns over cranks and then makes a big PUFF! But it will start if I spray the starter fluid. What else can it possibly be after already replacing all that? 5 stars to anyone that give the best detailed answer! Thanks so much for your time!