Ford KA - engine trying to stall when pulling off

From Birmingham,

Dear all

I have a 98 Ford KA.

There is a problem when accelerating from engine idle where the engine seems as if it wants to stall, then struggles a bit (for about a second) before the revs increase. This problem occurs when in nuetral aswell as when in gear.

It is baffling me and will be grateful of any suggestions. I havent tried to fix it yet becuase i thought i'd see if anyone had any suggestions as to the cuase.

Thanks in advance

Paul