Running issues HELP

[Slam Wagon]

Ok so left work, revs were fine, just up the road and idle was bouncing around 1200 revs rather than the 750/800 mark. Pull off give it some revs and this seems to settle back down to normal.

Then at around 2750 mark when accelerating slowly it just stops reving and waits at the 2750 keep gently pushing the pedal down and it eventually continues reving more. When it pauses it feels like the car physically slows and if i accelerate hard from lower down it doesnt seem to have any problem.

Any ideas of what to try or where to look are greatly appreciated.

Thanks

Ian