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It sounds like you need a good tune-up, such as spark plugs and/or wires. They will act up when cold and when warmed by engine temperature will let the engine run smoothly again. And possibly a distributor cap/rotor.
Did you replace the fuel filter when you replaced the pump ? Was it running rough before the pump was replaced. Did you replace the cap and rotor too ? "Sucking a ton of air" could be a vac leak, or the sound of the throttle open when the engine is bogging down. Is the check engine light on when it is running ?