my car just started this sputter when im driving anyone know what can be the problem? I already added a bottle of fuel injector in it didn't help

why is it so damn hard to get someone to tell you what they might think it is. I just want to know what could possibly be the problem. I would consider any reasonable suggestion to what it might be. I just need some help in what to look for to ask is it this part or that part. I know that it is not the Fuel Pump as that was replaced, its not the Throttle Positioning Sensor either, Carborator is fine. Please Help someone out there has to have some idea what this problem it and what to do!