6 speed manual gearbox. When I accelerate from around 1800 RPM it appears as if the clutch is slipping. The engine revs rise about 6-800 rpm then drop back and acceleration is equivalent, no speed increase and then when the revs drop back it accelerates, just as if I were feathering the clutch, or going on and off the gas. Obviously I am not "sitting" on the clutch, or pumping the gas. Any ideas what might cause this?
It might well be, and this is my suspicion. I would expect the usual smell of burning clutch plates that normally goes with a slipping clutch. Thank you for your reply, I could not think what else might cause this and wanted to get a wider opinion.