Whilst driving to work this morning I was just coming off the exit on a roundabout and the road was clear ahead so I decided to give it the full beans in 2nd gear (I can't help it the noise is wonderful ;-) ) and as the revs built up I had a slight hesitation in power I could feel the car back off slightly and then it carried on revving away as normal. As this happened I think around 5500rpm to 6500rpm I thought I'd take it up that far in 3rd gear and it didn't happen again !!! Any ideas what would cause this slight loss ?? Thanks in advance.