The high idle could be due to a stuck auxiliary air valve, which is a common problem on D jet cars that have sat for a long time. It is supposed to be open when the engine is cold, and close gradually as it warms up. It contains both brass and aluminum parts, so is prone to corrosion if not exercised regularly. Sometimes, if its not too bad, you can free it up by removing it, squirting Blaster on it around the edges of the moving parts and heating and cooling it until you can see the piston moving.