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Idle speed depends on a number of factors; for instance it may idle faster when the air conditioner is on. Instead of a fixed idle speed, as in the old cars, the engine computer sets the speed to whatever is needed to run any accessories and maintain smooth operation, but generally not more than that. That's under normal circumstances. There are several failure modes that cause erratic idle speed; usually the engine will also run roughly.
Need year/make/model/mileage of vehicle to provide a more specific set of troubleshooting steps.
When was the last tune up? Hard starts when cold are usually caused by fouled spark plugs, worn plug wires, or weak ignition coils. Fuel systems are not as effected by temperature changes as the ignition components.
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