i think u step on the brake hard and dont step on the clutch that hard too.Try to be alert with the clutch. Thats the problem with the series I nissan sentra (series I yan noh?) dyan nasira ang nissan sales, sabi nga nila"naiiwan ang engine pag daan sa humps". So thats wat they improved in their series II and added some goddies which revived them back to the circulation.