PSH
PCGB Member
My first port of call would be the idle control valve, it lives approx in the middle under the inlet manifold, a short metal cylinder. Get someone to turn the ignition on while you listen, you should hear a click, if not it may be stuck. Try disconnecting and spray some carb cleaner in to clear it. These parts aren't cheap...you can try tapping it to get it to move.
Pete
Pete