In the past few days my clutch feels like its starting to slip, if i'm shifting or allready in a gear and get a little more than normal acceleration the engine will rev up to about 4k then it will go down and all is normal all this happens inside of 3-5 seconds. Its the stock clutch and has never been replaced to the best of my knowldege. I just want to make sure its the clutch and not someting else, any ideas?