Mercedes Benz repair: 86 560sl with fast idle in park, mercedes benz 560sl, vacuum leaks

Question
The car has 119,000 miles, I had the alternator and battery replaced 2 days ago.  The fast idle in park didn't happen til the alternator went out and I thought it might improve when it was replaced but it didn't.  I'm in Kelso, WA, nearest to Portland Oregon. Thank you very much for your fast reply to my question.
Kathi
-------------------------

Followup To

Question -
I have a 1986 560SL.  The problem is it is idling extremely fast in park.  Then when I drive at 40 and up then let off the gas it wants to surge, when I slow down below 40 it stops surging.  Any help or suggestions would be appreciated greatly.

Answer -
How many miles on your car?

Best guess:

Vacuum leaks
Alternator
Distributor Cap
Distributor Rotor
Ignition Coil
Ignition Wire
KE Control Unit
Reference Sensor
Spark Plugs
Voltage Regulator
Altitude Sensor
Cold Start Valve
E.H.A. Valve
Fuel Injector
Fuel Injector Seal
Idle Control Unit
Idle Control Valve
Water Temp. Sensor

Where are you = state + nearest major city?
I will try to locate a good independent MB shop near you for diagnosis/repair.

Answer
Replace the fuse in your overload relay.
If this does not fix the issue, try taking it to one of these shops:
Oregon
http://www.mercedesshop.com/shopforum/forumdisplay.php?f=68


PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1986 Mercedes Benz 560SL
Part: Overload Relay
P2056-18124 Overload Relay Germany IN STOCK $67.74

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=merc