Can someone help me, I have a GTR R32 that is surging. It feels like it is staving of fuel. When I'm driving along it feels like someone keeps tapping the brake. It does this when cruising as well as when I'm giving it a bit. It also has trouble idling, like it is going to cut out but never does then fires back up and revs quiet high. The funny thing is that it doesn't do it all the time, but it will do it for about 3 or 4 days then go away for a while then come back again. The car has done 110000kms, it's standard except for catback exhaust, timing belt changed at 88000kms and just had new plugs put in it. Can someone put me on the right path please.