Rover 216 auto problems?

Hi I just bought a P reg 216 and have noticed a slight hunting on tick over. I have changed sparks and checked gap, replaced dizzy cap and arm, leads, oil,air and fuel filter. I checked around inlet manifold for air leaks couldn't find any. Is it also meant to rev about 1000rpm? also sometimes it cuts out when you engage drive when cold. Help PLEASE!! Many thanks Simon