can any body tell me if these simptons could have any thing to do with the cambelt when i start my 1.6 stilo the revs shoot up for a bout 3or4 seconds it is jerky as the revs drop down when driving it its not smooth on the pedol when you touch it there are no codes stored and there is a slight rattle rouwnd the cam belt erea i was tolt the cam belt was changed when it had a replacement engine i have cleaned all the throttle out and dun a relernbut still has this problem i could realy do with picking your brains out there