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      Engine performance is not good

      my ecotec engine acceleration was not good and its sound was rough somewhat. I changed the oil with castrol edge 10w-40 and the sparks plugs with ngk laser iridium IZFR6F11 and I am using acedelco green coolant. My engine is about 26 k miles.
      What are the possible causes for that?
      Last edited by drmagieed; 08-28-2016 at 10:00 PM.

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