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I have fault codes P0301 and P0017 come up. Car is a 2012 C250 sport with 178k miles on it. Car sometimes misses while sitting idle and in gear. Car sometimes stutters while trying to accelerate. Sometimes I hear a rattling from the engine bay, similar to what I have been told could be the cam adjusters, but does not make this sound always. When first started in the mornings, it runs good for about 30mins then sputters, then the stuttering when accelerating starts up along with the rattling sound. I can turn the car off and wait 5-10 mins crank it up and all seems good for while longer, and sometimes it clears up just while driving. Any ideas? Do these seem to all be connected? I did find oil in the spark plug wells, and will be pulling the coils and plugs this weekend and changing the plugs out, would this cause all of the above? I know the reason for the oil could be a bad valve cover gasket.
 
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