hey guys I haven't posted much on the forums yet, I've had my 97 s2 r33 for about 5 months now and it's been absolutely awesome, I love it. Haven't had amy problems with it till now, I've just noticed over the last couple of days that when I'm in 4th gear flooring it the revs seem to go up to around 4000r/min then it holds there for a while.. Sometimes the revs flick Down to 3rpm for a second then back up slowly to 5rpm. It feels like it's lost abit of power and also sounds like the engines lagging abit. I'm gonna take it in for a service next week, anyone have any idea what it could be?