Seems i have another on going issue this one now with the clutch!!, on a motorway in either 5th or 6th at 3500 rpm when putting my foot down it slips up to 4000 rpm then comes back down to 3500 rpm the bizzare thing is its only in these gears and not everytime?? Is this the beginning of my clutch wearing out?? Cars only done 28K miles and never does this when drivin hard in 1st 2nd and 3rd!!