Hi there, my low revs jitter, which was a pain in the bum and nearly made me sell the car, was cured by an Uprev remap, carried out by Dynatune at East Kilbride, a chap who really new what he was doing, its to do with the exhaust valve variable valve timing being to far retarded at low revs. I had changed plugs , oils, filters , cleaned maf sensors you name it all to no avail. I even had my local Nissan dealer put it on their diagnostics equipment as they stated that they had "state of the art" diagnostics equipment who came up with a £50 bill and said it needed all 4 oxygen sensors changing at a cost of £1250!!! Nothing wrong with oxygen sensors as the Uprev cured it, and its been a dream to drive ever since.