Random running at 3000rpm! on TVR Chimaera

[milesroyston]

So, I filled up with fuel this morning and my Chim has started stuttering and not running right at 3000rpm, fine before 3000 and fine after. Plugs are all good and engine runs and ticks over fine. Does seem a little sluggish but nothing massively noticeable. Brought it back from Blackpool a couple weeks ago and she drove the whole way perfect 9Blackppol to Dorset), just randomly happened today. Any ideas, before she goes into the garage?