Accelerator problems?

could be your clutch going

Clutch sounds a fair shout to me, do the engine revs sound as though they are surging up and then coming back to normal levels when changing?
I had a similar symptom that started on my 1ltr recently and it turned out to be collapsed baffles in the back box restricting the engine.

It has been noticed that most of the accelerator problem is happen due to the clutch.

I had an accelerator problem once, mine was caused by a pipe leaking air into the throttle body which gave a false accusation and therefore the revs would rise and then drop very slowly. I had only just bought the car aswell, thought i had broke it haha