From: scientist77017@gmail.com   
      
   After replacing ignition coil and plug for #3 cylinder, my mechanic found   
   heavy carbon buildup on all valves. The car only has 108K miles. He is   
   replacing the fuel injector and egr valve along with cleaning the valves.   
   He plans on cleaning using WD40 and a brush.   
   Is this a common problem?   
      
   Thanks.   
      
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