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2009 Chevrolet Malibu CEL

check engine came on 3 days after leaving a garage. Had the 4 sparks plugs changed the ignition coil replaced and a fuel system clean out. seems to be running pretty good other than idling randomly but check engine light is on

Starting point is having the codes read or paying for a proper diagnosis. Throwing parts at it, without knowing the cause of the CEL, can be a more expensive cure.