Hello to all. I have a 1984 Eldorado with the good ol' HT4100 engine. It runs smooth but the idle is way too high. Don't have a tach so I'm guessing somewhere around 1000 to 1200 rpm warm. Obviously it's higher when cold. I found some old posts on this topic but having read through them I am seriously afraid to try and adjust it. It seems there is an ISC, booster motor, sensors, etc. which need to be synched and working in order to get the idle down to around 600/800 rpm. Am I correct? The car is now in Germany so I can't go down to O'Reilly's and get new parts. I read about "Idle learn" which sounds like a good place to start but don't know where to find it. Is it a website or something in the shop manual? I just want to gather info to access the complexity before I go on to getting under the hood. Any suggestions or help would be appreciated.