190E 2.0ltr idle speed

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Hi all
I am new to this and only just bought my `91 2.0ltr 190E.It`s a manual,got 76.600 miles on the clock,and with decent but not full service historie.Please forgive me if there already is a thread about this which I havent spotted.My problem is that the car can be difficult to start,I have to leave my foot off the accelerator till it starts and then slowly open up the accelerator.Before I drive off the idle speed is ok,but as soon as I drive off and come to stop the next time,the idle speed sits at approx 1100 rpm.I have heard about a idle speed air valve.If this is the problem,where do I find it and what do I do when I find it?
 

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check your voltage protection relay and fuse.
 
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Thanks for that.Have had a look,and it does not look as if there is a voltage protection box(sorry,first time owing a Merc and not a mechanic)I have been lead to believe that it should be situated near the battery,but cannot find anything.
 

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to the left of battery behind plastic shield.
 


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