I think you'll find you have gearchange cables not rods! I'm not sure exactly which gearbox is used in the 2.2 petrol, but, in the 2.2 diesel a larger gearbox is used than in the other diesels. (the clutch input shaft has 21 splines instead of 18) If this gearbox is used there is a small linkage assembly on the top of the gearbox which is attached to the selector on the gearbox with a single nut and bolt. This can work loose allowing the gears to feel loose. Tightening the bolt cures it. I know this is not very clearly explained (sorry) and if you have a normal BE4 gearbox it does'nt apply.