Depending on the make and model it could be a number of things, but the first thing I would suspect would be a clogged throttle body. Your engine requires air and gasoline to run and you might not be getting enough air into the system to get it going. You can remove the throttle body which is on top of the intake manifold usually and clean it. I would also change your spark plugs and add a fuel system cleaner for good measure. However, with it having trouble when being at a stop, I would guess the problem is air.
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