ford focus

[Frizz]

I own a 2004 Ford Focus ST170 and for some time now the vehicle becomes very hesitent when driven at slow speeds. I have spoken to Sky Ford about this but they say they dont notice it.Has anyone got any ideas of what it may be cos its realy anoying now. It does clear as soon as you put your foot down but happens again after yopu slow down. Its not constant so can be a real pain when its at a garage. It does Happen first thing in the morning when i start off.

Thanks