Please don't spray carb cleaner near your MAF / AFM or idle control valve, as it F....Ks more than it mends. Simply take off the induction hose (Black pipe approx 3" diameter on passenger side of engine) from the inlet manifold and wipe out all the black crap from the inlet manifold and around the throttle butterfly. If its really bad you can spray some carb cleaner onto the rag you are using and wipe with that. DO NOT spray straight into inlet manifold!. When clean, refit pipe and should now be fine.
You can manually open and move throttle butterfly with ignition off and have no probs, but do not move with ignition on.
Ultimately if this does not work you can reset the idle parameters with the alfa examiner, before surrending to a new unit.