2005 cobalt, shuts off while driving.diagnostics code read "emmisions"

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put new catilyic conv.(April), coil pack(march), new sparkplugs(march), cleaned throttlebody(march) car ran good till june, still shutting off,no warning, while on freeway.Today, started vibrating hard, after tapping coil pack again restarted. checked motor mounts-not loose, engine came on and stayed on.