hey mpolli thank you for your help. your cool and thank you for trying. i couldn't find anything cause the search or no one has posted anything like this under c280. hope this helpes other in the future.

http://www.peachparts.com/shopforum/showthread.php?t=214820&highlight=adjusting+idle+pulley

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1998 C-280 4 Dr Sedan, Black, Automatic