Misfire on startup (intermittently), pressing gas pedal fixes issue?

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New member
Sometimes when I start my car it feels like my engine is misfiring, like not all the cylinders are igniting and it causes the car to shake. In order to start the car I have to give it gas, once I step on the gas, it increasingly gets better and better until it eventually smooths out and runs perfectly. It never misfires while driving, idling, or at any other point in time.

It's a 2000 Honda Civic EX with 156k miles

Ideas?
 
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