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Hey ppls!

Just got a c class merc c180 20 20 chassis with a 111 engine! doesn't run smoothly at idle seems to speed up and slow down but only very slightly! didn't know if this was usual? :(
 

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the 111 isn't know as the smoothest running engine in the world, but if your rpm's are hunting you may have a slight vacuum leak. how many miles on the motor? it may be time to change the plugs, etc. do youhave any current MIL's illuminated? any other information you can offer will be helpful
 

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I once a similar problem till I went to a local mechanic who found out that my fuel mixture ratios were not right. He managed to correct them using that MB computer diagnostic kit, all is well till now. Dont know if that will help you
 
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