Very ironic that you mentioned that. I also have a 1985 380SE and I just got back from an errand. I did not notice it when driving in town, but when I pulled in the driveway, it was idling at about 650 rpms (in gear) and idling at about 900 rpms in park, whereas it was idling at 750 in park and about 500 at idle. I shifted into "R" to see if it stalled out like it had been doing after the engine was totally warmed and it did not stall, but it harshly banged into gear. Something is not right here.