Now ive only just started getting mechanically minded but to me this seems like it may be a clutch plate issue, im no expert though, it makes the rattle while riding rough roads but the acceleration is staggered and i really struggled to get it upto 60, its only a 1ltr corsa so i know its not a quick car but it never takes that long. seems like a lot more revs is needed which is why i thought i may have shattered a plate or it may be a spring, anyone got any clues?