Picked up my Astra van today. Its a v reg and has done 159k. It drives really well but the gear shift is a bit annoying and I cant do a quick gear change. There is the usual movement left to right and then a wobble in the actual shifter (even in gear). Is it some sort of bush that needs replacing? Also it doesnt spring back to the middle very well? I presume it either needs greasing or some sort of new spring?