the only way your going to know for sure is to look at your rev counter!! do 30mph down a straight road and with ya clutch down and in 4th rev the engine to 4.5k and lift clutch up quickly and put ya accelerator peddel down to the floor at the same time, you will soon know if its your clutch or not.

test your tps also, other than that, may need setting up on rolling road!

let us know how you get on