S2000 strange hesitation

[s2tommi]

Hi all,
At a bit of a loss with this one. Its been a problem for a while but not driving the car much i'm only just getting round to sorting it. The car has a slight hesitation that occurs when going over bumps, or sharp cornering, such as a roundabout. This can be on full throttle or part throttle. Ive change the coils, plugs and fuel filter.
Does anyone have any ideas?
Thanks in advance
Tom