Engine light on 2007 Chevrolet Equinox

Engine light comes on, sometimes goes out; why? What does this mean?

Asked by for the 2007 Chevrolet Equinox
Here is some info about the check engine light:
2 more answers
I have found that my gas cap comes lose sometimes and causes the check engine light to come on. After tighening the cap and driving a or sometimes just after restarting the light will go off.
If the check engine is flashing intermittantly, it meamns that you have a misfire or youe engine not burning all of the fuel supplied to the cylinder(s); possible strain on catalytic converter because it cannot handle the high level of unburned hydrocarbons.
Otherwise you may have some intermittant code causing the light to appear for about three driving cycles(a cycle is starting the car, driving it for short while, stopping the car, turning ignition off and closing driver's door)because the problem had disappeared temporarily.