Mercedes Benz 500sl Questions

i have a 500 sl 85 merc havent driven in 1 yr ...

i have a 500 sl 85 merc havent driven in 1 yr just starting driving and its idleing high in park, when car get hot and in park it seems to do this. it also jerks a little when i put in reverse. help!!

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I have a 1992mercades Benz sl500, the car runs great ,has very low mileage, but it's been parked for about 10 years in storage ,changed fuel pump,cleaned gas tank and filters,put in new gas,started car up ,it runs well, no taps at all, the problem