My mate has got a vauxhall astra 1.4i, 1991, and what a sh*t car it is too. Anyway he is having real problems with it. The engine idling is all over the place, and there is a knocking noise coming from the gearbox/clutch area. When the clutch is depressed the knocking stops, and the idling sorts it self out. When driving it the knocking gets worse, and he has to drive it in 1st 2nd or 3rd at really high revs to get anywhere. The knocking is worse under load. Any ideas? Any help at all would be appreciated.