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Registered 2004 SLK200
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4 Posts
Discussion Starter #1
NO check engine light on and no codes
Cold start when i put transmission in D with brake applied the RPMs go up and down for a while.
Suspected vacuum leak, but did not find any. 12$ hose replaced with new.
After that is running fine till next cold start.
Any ideas?
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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98,265 Posts
normal to go up to above 1200 then settle down to like 750 after about 30 secs in PARK

so you are waiting until it goes down before putting in drive?
 
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