While approaching a stop light I disengaged the ISG switch. As the light changed I stepped on the gas pedal and the rpms immediately backed down. I was able to continue by gradually stepping on the gad peddle and attained a speed of 50mph. However anytime I depressed the accelerator as in normal driving, the engine backed down and I had to depress the pedal slowly to move again. Dealer said it had a fuel rail code. Waiting to hear from them. Anyone have similar problems?