when i pull away quickly in all gears it really isnt smooth!

its as though i floor it, come of the gas, floor it again, come half way off and finally floor it and stay on the gas.

this only happens in the gear i start to floor it in and then the gears that follow will be ok

but i could floor it in 1st 2nd 3rd 4th or 5th and it will do the same

please help me

my car is an m reg astra mk3 1.8 16v sport

very gratefull-cheers