what does it mean when my car shuts off and the check engine light comes on?

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my car runs fine and then out of nowhere while im sitting at a stop light it will shut down the check engine light comes on and so does the brake light. when it does this I put my car in park turn off the ignition and then wait 20-45 seconds (sometimes longer) turn the car on again and rev the engine a few times up to 5-6 rpm then put my car in drive and it will allow me to drive. Please help me diagnose this problem!!