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Alright at idle the rpms are normal, but the engine is doing alot of abonormaly vibrating and you can feel it knock irregularly, you cant hear them but you can feel them, some knocks are harsher then others. What can be the cause of this and what am i looking to expect ford to tell me when i bring it to them, i just like to have some knowledge before i go there so that they just dont play it off like theres nothing wrong.