The bite point on my 1.8 C5 is odd. It's as if it finds the biting point before losing and finding it again. It makes pulling away quite awkward as I cant be delicate and precise. If I try and pull away normally the car judders like it is going to stall. Also, when I rest my foot on the clutch pedal really lightly I can feel the pedal almost vibrating or grinding. The car accelerates fine and goes in and out of gears no problem. Any advice?