Try checking the conection at the cam sensor, my car was sputtering like crazy, and it got to the point where my car wouldn't even idle fine. while it was acting up I wiggled the wires at the sensor and the car shut off. I removed the connector and I reconnected it and I pushed the connector in to make sure it was tight, then I started the car and it drove perfect, I'm not saying this will fix every car with this problem. Just letting you guys know something else to check for.