I do have the maintenance disc set for my 92 400E.



My 400E will misfire when it is idling like at a stop light and cut out a cylinder or two from functioning until I restart the car to reset ????. I have already changed out the Distributor caps, rotors and plugs a year ago. This problem ONLY occurs in 70 degree or higher weather and ONLY happens when the car is IDILING like at a stop light. The problem has never occurred while in motion. It is summer again and the problem is back. The wiring looks OK. I have 150,000 miles on it. The hotter the weather the more often the problem occurs. Sometimes it feels like one cylinder shuts down and at other tiimes it feels more like two. I know that the car will shut down fuel or spark to a cylinder that misfires until the car is restarted but I don't know where I should start to look for the problem. Any clues?