I am new to this site, but I have found many useful posts on here. I appreciate all the good info. Here's a good stumper for the group on my 94 E420...It has recently developed a high idle issue (@1100rpms) in park. There were no warning lights on the dash, but I decided to pull codes anyway to see what was going on. Code 6 was displayed on my Baum scanner which says "idle speed incorrect; fault from EA/CC/ISC". After some trouble shooting, I decided to replace the throttle actuator, brake light switch, and neutral safety switch. The car still has the high idle and the car always has that code return if when I clear it. All parts are from the dealer and brand new. Vehicle temp. does not seem to make a difference. Any thoughts?