Sorry to get in on the other guys thread,
i reset the power fc back to stock r33 base map, fuel pump is new and was fine the past month
im still running the 044 fuel pump but with stock injectors and afm,
will try checking the sensors wen it happens,
it happened just before at 10kmph the car behind me almost smashed into me as its like i hit the brakes then it throttle cam back on 2 secs later and was all back to normal