Mercedes: 1991 Mercedes 190E 2.6 liter, mercedes benz 190e, vacuum leak

Question

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Finally got my 190E 2.6 liter running with your help.. Thanx! I replaced the air mass meter & now when it idles , the RPM is constantly searching for a constant RPM .. It fluctuates about 150 RPM.. I also get a check engine light.. I pulled the plugs & they are running rich as well.. The idle is real low as well.. Dies when put into gear..Any suggestions of what could be going on now? Thanx again!

Answer
Answer:
A 150 RPM idle surge makes me suspect a vacuum leak.
A breather hose or injector O ring could cause this issue.


Vehicle: 1991 Mercedes Benz 190E 2.6
Part: Breather Hose
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   Breather Hose
From valve cover to intake manifold.      
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   Breather Hose
From idle speed actuator to intake manifold.      
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   Breather Hose
From air duct to idle speed actuator.      
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   Breather Hose
From valve cover to air filter housing.  

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