I've noticed a worrying "click" sound when I press the accelerator and a matching "clack" when I release it. Most noticeable in a low gear 20-30mph and it only happens when you are actually in gear (i.e. not if the clutch is in). Doesn't need harsh acceleration to get the noise - quite the opposite in fact. The slightest touch of the pedal and as the engine takes up drive I hear the noise, and then when you release and the engine "relaxes" its like something clicks back. I can even reproduce it now just by flicking from 1st to reverse and back repeatedly, just raising the clutch to the biting point in each gear - no accelerator required. It sounds like its coming from behind the glovebox, but must surely be in the engine bay. I was wonder about gearbox/engine mountings, anyone got any other ideas?