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2011 Grand Cherokee
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I have a 2016 Summit with 3.6L with 84k miles. Had same problem but mine threw fault codes. Misfiring on No. 2 cylinder. They said lifter was stuck and was worn. They had to replace lifter. Fortunately was covered under Certified powertrain warranty.
I have a 18’ Grand Cherokee high altitude 3.6. Recently started shaking only while idling. It is most noticeable when the vehicle reaches its warm temperature, while driving you don’t feel it but at a stop sign or red light you can feel the vibration and actually see the passenger seat vibrating. Any idea what can be causing this problem?
 
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