Hi, Lately the idle speed on my son's 1988 190E has been very erratic. It usually runs around 800 but for no reason sometimes goes as high as 2500 and gets stuck there. If the gas pedal is hit a couple of times it usually goes down to normal. Occasionally when hitting the gas pedal does not work he has to shut the car off and start it again. It happened with both a warm and cold engine. I tried cleaning the linkage and lubricating but it still happened. Any suggestions would be greatly appreciated! Thanks, Bob Koziak 1988 190E 128K 1983 300D 116K 1990 300E 87K 1