Its prolly your throw out bearing.... very common that happens on the 6 spd.... get it changed it'll fix the problem... though pending on how much u abuse it.. it might come back again.... or when u go twin or triple disk.... it'll be all the time chattering then... check the FAQ on MKIV.com it'll tell you about that chattering too... hell I got sick of changing it.... I just left it... so it chatters when it feel like it.... 