Date registered: Sep 2002
Vehicle: Previous: 1989 190E 2.6, 1997 E420, 1985 380SL, 1975 450SLC
Location: Martinez, CA
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Change those tires pronto! Riding around on 25 year old tires is a recipe for disaster.. even if they have plenty of tread left. As for the 1500rpm idle, search this site for '380SL high idle' and you'll find several likely causes, including the 'green wire' issue that caused in intermittent high idle on my 1985 380SL.
You'll want to flush/change every fluid in the car, including differential, transmission, power steering, brakes, coolant, and even the gas in the tank if that's been sitting a long time (running stale old gas through your car's fuel injection system could cause lots of expensive problems!)
Inspect spark plug wires; replace if brittle. Replace all fuses with new brass-tipped fuses, cleaning the fuse brackets with contact cleaner before reinstalling the new fuses (fuse box is by passenger's right foot behind little door). Install new filters: Fuel, air, oil, power steering, transmission. The A/C most certainly needs service, too, assuming you have plans to use it and not the open conv. top.
Avoid the MBZ 'stealer' and instead find a well-respected independent repair shop that specializes in Mercedes of your car's vintage.