rough idle, jerking motion

Having a similar problem like others, when sitting at a stop sign my 2011 Chevy equinox starts a rough jerking motion back and forth. It also have a rough idle when in park. But there is no check engine light on.does anyone know what would cause this. Dealership can't seem to duplicate issue.
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My 2012 equinox just started doing the same thing can you tell me what the problem is?