Hi. I have a Nissan Pathfinder 2005 model which is the d51 I believe. However the problem I have is that when I start the car the revs fluctuate and sometimes cuts the engine off. Other times when I'm driving and changing gear when I put my foot on the clutch the revs drop and cuts the engine off which is dangerous. It's been plugged in 4 times and shows nothing. Does anyone know what it could be?