I took out the idle control unit and checked for cold solder cracks, the board looked fine but, I resoldered the contacts anyway.

Unfortunately this didn't help at all.

Yesterday I took out the idle control valve (someone else referred to this as a throttle slide). It had a lot of carbon in the two outlets. I tried to clean it. I didn't open it up but poured in some gasoline and shook around until it came out clean.

I seem to have had the fast idle problem since I've done this (its not intermittent anymore).

Any thoughts on if this part causes this problem or, did I destroy some sensor by the way I tried to clean it?

BTW, part number is 000 141 14 25

I appreciate your thoughts.

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1983' SL500 euro