Quote:
Originally Posted by 86560SEL
My friend with the 1990 300SE has erratic idle when in gear. Sometimes the idle will go up and down and sometimes require harder braking when it idles up. Anyone know what causes this?
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My bet is on the airflow potentiometer. There are a few people who sell them on eBay and here are the instructions to adjust it. I had the exact same issue and that fixed it for me.
http://sg-motorsports.com/AFS%20Pot%20write-up.htm