Car shakes when idling or braking but not when driving
You would probably get more help with more description and info on the vehicle…
Engine size, miles, FWD/AWD…
CEL light on??
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Shaking at idle is often an engine misfiring problem, for which there are at last half a dozen common causes. The first step is determining the computer’s diagnostic codes.
One of the posters here has quite a bit of Equinox diagnoses & repair experience , maybe they’ll chime in.