My nox is starting to shutter consistantly from 1700 to 2000 rpm only when I am cruising down the road in, I guess 5th gear. It only does it when you try to accelerate slowly. If you press down good enough of course it down shifts and all is fine. I have thought about plugs and wires and changing the trans fluid. I just dont want to dump $ down the drain on things that wont fix it.